diff --git a/src/IntWalk/IntWalk_PWalking.lxx b/src/IntWalk/IntWalk_PWalking.lxx
index b9216b56f8..fe5ea6f1d4 100644
--- a/src/IntWalk/IntWalk_PWalking.lxx
+++ b/src/IntWalk/IntWalk_PWalking.lxx
@@ -65,15 +65,17 @@ inline const gp_Dir& IntWalk_PWalking::TangentAtLine(Standard_Integer& theIndex)
 
 inline void IntWalk_PWalking::AddAPoint(const IntSurf_PntOn2S& POn2S) { 
 #if REGLAGE
-  Standard_Integer n=theLine->NbPoints();
+  Standard_Integer n=line->NbPoints()+1;
+  if (n == 1)
+  {
+    std::cout << "Dump of WL" << std::endl;
+  }
+
   if(n) { 
-    gp_Vec V(POn2S.Value(),theLine->Value(n).Value());
     Standard_Real u1,v1,u2,v2;
-    Standard_Real U1,V1,U2,V2;
     POn2S.Parameters(u1,v1,u2,v2);
-    theLine->Value(n).Parameters(U1,V1,U2,V2);
-    printf("\n%3d: (%10.5g)(%+12.5g %+12.5g %+12.5g) (%+12.5g %+12.5g) (%+12.5g %+12.5g)",n,
-	   V.Magnitude(),V.X(),V.Y(),V.Z(),U1-u1,V1-v1,U2-u2,V2-v2);
+    printf("point p%d  %+10.20f %+10.20f %+10.20f\n",
+           n, POn2S.Value().X(), POn2S.Value().Y(), POn2S.Value().Z());
     fflush(stdout);
   }
 #endif
diff --git a/src/QABugs/QABugs_11.cxx b/src/QABugs/QABugs_11.cxx
index 8aab688563..d25029f35e 100644
--- a/src/QABugs/QABugs_11.cxx
+++ b/src/QABugs/QABugs_11.cxx
@@ -950,56 +950,6 @@ static Standard_Integer OCC277bug (Draw_Interpretor& di, Standard_Integer nb, co
   return 0;
 }
 
-#include <ShapeAnalysis_Edge.hxx>
-
-static Standard_Integer OCC333bug (Draw_Interpretor& di, Standard_Integer n, const char ** a)
-{
-  if( n < 3) {
-    di<<"-1\n";
-    di << "Usage: " << a[0] << " edge1 edge2 [toler domaindist]\n";
-    return 1;
-  }
-  TopoDS_Shape Sh1 = DBRep::Get(a[1]);
-  TopoDS_Shape Sh2 = DBRep::Get(a[2]);
-  if(Sh1.IsNull() || Sh2.IsNull()) {
-    di<<"-2\n";
-    di<<"Invalid arguments\n";
-    return 1;
-  }
-  TopoDS_Edge e1 = TopoDS::Edge(Sh1);
-  TopoDS_Edge e2 = TopoDS::Edge(Sh2);
-  if(e1.IsNull() || e2.IsNull()) {
-    di<<"-3\n";
-    di<<"Invalid type of arguments\n";
-    return 1;
-  }
-  Standard_Real aTol = Precision::Confusion();
-  Standard_Real aDistDomain = 0.0;
-  Standard_Integer k = 3;
-  if(k < n)
-    aTol = Draw::Atof(a[k++]);
-  if(k < n)
-    aDistDomain = Draw::Atof(a[k++]);
-
-  ShapeAnalysis_Edge sae;
-  if(sae.CheckOverlapping(e1,e2,aTol,aDistDomain)) {
-    if(aDistDomain ==0.0) {
-      di<<"1\n";
-      di<<"Edges is overlaping comletly\n";
-    } else {
-      di<<"2\n";
-      di<<"Edges is overlaped\n";
-      di<<"with tolerance = "<<aTol<<"\n";
-      di<<"on segment length = "<<aDistDomain<<"\n";
-    }
-  } else {
-    di<<"3\n";
-    di<<"Edges is not overlaped\n";
-  }
-  return 0;
-}
-
-
 #include <DDocStd_DrawDocument.hxx>
 #include <TDataStd_Name.hxx>
 #include <Draw.hxx>
@@ -4830,8 +4780,6 @@ void QABugs::Commands_11(Draw_Interpretor& theCommands) {
   //theCommands.Add("OCC277","OCC277", __FILE__, OCC277bug, group);
   theCommands.Add("OCC277","OCC277", __FILE__, OCC277bug, group);
 
-  theCommands.Add("OCC333","OCC333 edge1 edge2 [toler domaindist]; Check overlapping edges", __FILE__, OCC333bug, group);
-
   theCommands.Add("OCC363", "OCC363 document filename ", __FILE__, OCC363, group);
   // Must use OCC299
   //theCommands.Add("OCC372", "OCC372", __FILE__, OCC372, group);
diff --git a/tests/bugs/modalg_2/bug251_1 b/tests/bugs/modalg_2/bug251_1
index 7b5dfab269..6a96082df2 100755
--- a/tests/bugs/modalg_2/bug251_1
+++ b/tests/bugs/modalg_2/bug251_1
@@ -1,13 +1,7 @@
-pload QAcommands
-
 puts "================"
-puts "OCC251"
+puts "OCC251: Section of two faces f1 and f2 depends on order of arguments:  section r1 f1 f2 and section r2 f2 f1 give different results, one of result is invalid - overlapped edges."
 puts "================"
 puts ""
-###########################################################
-## Section of two faces f1 and f2 depends on order of arguments:  section r1 f1 f2 and
-##  section r2 f2 f1 give different results, one of result is invalid - overlapped edges.
-###########################################################
 
 restore [locate_data_file OCC251.brep] f 
 explode f
@@ -17,19 +11,27 @@ checkshape f_2
 bsection result f_1 f_2
 explode result
 
-set status [OCC333 result_1 result_2]
-if {[llength ${status}] < 1} {
-    puts "OCC251 ERROR"
-} else {
-    regexp {([-0-9.+eE]+)} $status full code
-    if { ${code} == 3 || ${code} == 2} {
-	puts "OCC251 OK  (case 1) : Section command works properly"
-    } else {
-	puts "Faulty OCC251 (case 1): Section was made WRONGLY"
+foreach a [explode result e] {
+  foreach b [explode result e] {
+    if { ![regexp {not} [compare b_1 n_1]] } {
+      continue;
     }
+    
+    set coe [checkoverlapedges e1 e2 5.0e-5]
+
+    puts "$a <-> $b: $coe"
+    if { [regexp "Edges is not overlaped" $coe] != 1 } {
+      puts "Error: $a and $b are overlaped"
+    }
+  }
 }
 
 checkprops result -l 1. 
 checkshape result 
-checksection result
-checkview -display result -2d -path ${imagedir}/${test_image}.png
+checksection result -r 2
+
+smallview
+don result*
+fit
+
+checkview -screenshot -2d -path ${imagedir}/${test_image}.png
diff --git a/tests/bugs/modalg_2/bug251_2 b/tests/bugs/modalg_2/bug251_2
index 2a2a194acd..ae3cc79ce5 100755
--- a/tests/bugs/modalg_2/bug251_2
+++ b/tests/bugs/modalg_2/bug251_2
@@ -1,13 +1,7 @@
-pload QAcommands
-
 puts "================"
-puts "OCC251"
+puts "OCC251: Section of two faces f1 and f2 depends on order of arguments:  section r1 f1 f2 and section r2 f2 f1 give different results, one of result is invalid - overlapped edges."
 puts "================"
 puts ""
-###########################################################
-## Section of two faces f1 and f2 depends on order of arguments:  section r1 f1 f2 and
-##  section r2 f2 f1 give different results, one of result is invalid - overlapped edges.
-###########################################################
 
 restore [locate_data_file OCC251.brep] f 
 explode f
@@ -17,19 +11,27 @@ checkshape f_2
 bsection result f_2 f_1
 explode result
 
-set status [OCC333 result_1 result_2]
-if {[llength ${status}] < 1} {
-    puts "OCC251 ERROR"
-} else {
-    regexp {([-0-9.+eE]+)} $status full code
-    if { ${code} == 3 || ${code} == 2 } {
-	puts "OCC251 OK  (case 2) : Section command works properly"
-    } else {
-	puts "Faulty OCC251 (case 2): Section was made WRONGLY"
+foreach a [explode result e] {
+  foreach b [explode result e] {
+    if { ![regexp {not} [compare b_1 n_1]] } {
+      continue;
     }
+    
+    set coe [checkoverlapedges e1 e2 5.0e-5]
+
+    puts "$a <-> $b: $coe"
+    if { [regexp "Edges is not overlaped" $coe] != 1 } {
+      puts "Error: $a and $b are overlaped"
+    }
+  }
 }
 
 checkprops result -l 1. 
 checkshape result 
-checksection result
-checkview -display result -2d -path ${imagedir}/${test_image}.png
+checksection result -r 2
+
+smallview
+don result*
+fit
+
+checkview -screenshot -2d -path ${imagedir}/${test_image}.png
diff --git a/tests/bugs/modalg_3/bug600 b/tests/bugs/modalg_3/bug600
index fd7ee260ff..02c44c87fb 100755
--- a/tests/bugs/modalg_3/bug600
+++ b/tests/bugs/modalg_3/bug600
@@ -1,31 +1,32 @@
+puts "========================"
+puts " OCC600: Result of BOPCOMMON operation is unclosed shape inspite of source solids are valid"
+puts "========================"
+
+cpulimit 200
 
-puts "========================"
-puts " OCC600"
-puts "========================"
-## Result of BOPCOMMON operation is unclosed shape inspite of source solids are valid
-############################################################
-cpulimit 5000
 restore [locate_data_file OCC600_1.brep] a 
 checkshape a
 restore [locate_data_file OCC600_2.brep] b 
 checkshape b
 bop b a
 
-bopcommon result
+bopsection rs
+checksection rs -r 0
+checkprops rs -l 1439.11
 
-set square 41970.8
+bopcommon result
 
 set nbshapes_expected "
 Number of shapes in shape
- VERTEX : 55
- EDGE : 93
- WIRE : 40
- FACE : 40
- SHELL : 1
- SOLID : 1
+ VERTEX    : 55
+ EDGE      : 93
+ WIRE      : 40
+ FACE      : 40
+ SHELL     : 1
+ SOLID     : 1
  COMPSOLID : 0
- COMPOUND : 1
- SHAPE : 231
+ COMPOUND  : 1
+ SHAPE     : 231
 "
 checknbshapes result -ref ${nbshapes_expected} -t -m "Result of Boolean operations"
 
diff --git a/tests/bugs/modalg_7/bug28119_1 b/tests/bugs/modalg_7/bug28119_1
index b5666f1692..fe8fef9216 100755
--- a/tests/bugs/modalg_7/bug28119_1
+++ b/tests/bugs/modalg_7/bug28119_1
@@ -1,12 +1,15 @@
-puts "TODO OCC28119 ALL: Error: Cannot find the result of BLEND-operation. The result of BOP operation will be returned."
-
 puts "========"
-puts "OCC28119"
+puts "OCC28119: Blend fails on fused identical but shifted tori"
 puts "========"
 puts ""
-#################################################
-# Blend fails on fused identical but shifted tori
-#################################################
+
+# Different result between Debian 7 and Debian 8.
+puts "TODO ?OCC28119 ALL: Error: Cannot find the result of BLEND-operation. The result of BOP operation will be returned."
+puts "TODO ?OCC29910 ALL: exception"
+puts "TODO ?OCC29910 ALL: Exception"
+puts "TODO ?OCC29910 ALL: Error: Exception in bfuseblend operation"
+
+cpulimit 200
 
 # identical secondary radi
 
@@ -14,7 +17,9 @@ ptorus t1 100 10
 ptorus t2 100 10
 ttranslate t2 100 0 0 
 
-bfuseblend result t1 t2 5
+if { [ catch { bfuseblend result t1 t2 5 } catch_result ] } {
+  puts "Error: Exception in bfuseblend operation."
+}
 
 checkview -display result -2d -path ${imagedir}/${test_image}-2d.png
 checkview -display result -3d -path ${imagedir}/${test_image}-3d.png
diff --git a/tests/bugs/modalg_7/bug28764 b/tests/bugs/modalg_7/bug28764
index 192d1f6be9..25c5de6a8d 100644
--- a/tests/bugs/modalg_7/bug28764
+++ b/tests/bugs/modalg_7/bug28764
@@ -16,11 +16,12 @@ don f
 fit
 
 # Before the fix: Exception in Debug-mode only
-set log [bopcurves f_1 f_2 -2d]
-checkview -screenshot -2d -path ${imagedir}/${test_image}.png
+regexp {Tolerance Reached=+([-0-9.+eE]+)\n+([-0-9.+eE]+)} [bopcurves f_1 f_2 -2d] full Toler NbCurv
 
-regexp {Tolerance Reached=+([-0-9.+eE]+)} ${log} full Toler
+checkreal Tolerance $Toler 4.601149532364662e-008 1.0e-7 0.0
 
-if { ${Toler} > 1.e-7} {
-   puts "Error: bad tolerance of result"
+if {$NbCurv != 1} {
+  puts "Error: Please check NbCurves for intersector"
 }
+
+checkview -screenshot -2d -path ${imagedir}/${test_image}.png
diff --git a/tests/bugs/modalg_7/bug29910_1 b/tests/bugs/modalg_7/bug29910_1
new file mode 100644
index 0000000000..60aeab9963
--- /dev/null
+++ b/tests/bugs/modalg_7/bug29910_1
@@ -0,0 +1,46 @@
+puts "========"
+puts "OCC29910: Porting to Debian80-64 : Regressions in Modeling Algorithms"
+puts "========"
+puts ""
+
+# Different result between Debian 7 and Debian 8.
+puts "TODO ?OCC29910 Linux: Error :  is WRONG because number of EDGE entities in shape \"rs\" is 16"
+puts "TODO ?OCC29910 Linux: Error :  is WRONG because number of SHELL entities in shape \"result\" is 5"
+puts "TODO ?OCC29910 Linux: Error :  is WRONG because number of SOLID entities in shape \"result\" is 5"
+puts "TODO ?OCC29910 Linux: Error : The area of result shape is"
+puts "TODO ?OCC29910 Linux: Error : The volume of result shape is"
+
+ptorus t1 100 10
+ptorus t2 100 10
+ttranslate t2 100 0 0
+axo; fit
+bclearobjects
+bcleartools
+baddobjects t1
+baddtools t2
+bfillds
+bbop rs 4
+
+checksection rs -r 0
+
+checkshape rs
+
+if {[regexp "Faulties" [bopargcheck rs]]} {
+  puts "Error: bopargcheck has found some faulties in result"
+}
+
+checkmaxtol rs -ref 7.5e-6
+checknbshapes rs -edge 14
+checkprops rs -l 330.096
+
+bbuild result
+
+checknbshapes result -shell 6 -solid 6
+checkshape result
+checkprops result -v 382445 -s 82663
+
+smallview 
+don result
+fit
+
+checkview -screenshot -2d -path ${imagedir}/${test_image}.png
diff --git a/tests/bugs/modalg_7/bug29910_2 b/tests/bugs/modalg_7/bug29910_2
new file mode 100644
index 0000000000..178efaaada
--- /dev/null
+++ b/tests/bugs/modalg_7/bug29910_2
@@ -0,0 +1,37 @@
+puts "========"
+puts "OCC29910: Porting to Debian80-64 : Regressions in Modeling Algorithms"
+puts "========"
+puts ""
+
+# Different result between Debian 7 and Debian 8 and between MSVC 2010 and 2017.
+puts "TODO ?OCC29910 Windows: Error: Tolerance = 4.0169383828521568e-006 is not equal to expected"
+puts "TODO ?OCC29910 Linux: Error: Tolerance = 6.0392296447644325e-07 is not equal to expected"
+puts "TODO ?OCC29910 ALL: Error :  is WRONG because number of VERTEX entities in shape \"result\" is 7"
+puts "TODO ?OCC29910 ALL: Error :  is WRONG because number of EDGE entities in shape \"result\" is 5"
+
+restore [locate_data_file bug29910_f1.brep] f1
+restore [locate_data_file bug29910_f2.brep] f2
+
+regexp {Tolerance Reached=+([-0-9.+eE]+)\n+([-0-9.+eE]+)} [bopcurves f1 f2 -2d] full Toler NbCurv
+
+checkreal Tolerance $Toler 1.0e-7 1.0e-7 0.0
+
+if {$NbCurv != 4} {
+  puts "Error: Please check NbCurves for intersector"
+}
+
+bsection result f1 f2
+checksection result -r 4
+checkshape result
+checknbshapes result -edge 4 -vertex 6
+checkprops result -l 97.2011
+
+if {[regexp "Faulties" [bopargcheck result]]} {
+  puts "Error: bopargcheck has found some faulties in result"
+}
+
+smallview 
+don result
+fit
+
+checkview -screenshot -2d -path ${imagedir}/${test_image}.png
diff --git a/tests/bugs/moddata_2/bug333 b/tests/bugs/moddata_2/bug333
index 2917736ed4..d80400f170 100755
--- a/tests/bugs/moddata_2/bug333
+++ b/tests/bugs/moddata_2/bug333
@@ -1,37 +1,72 @@
 puts "================"
-puts "OCC333"
+puts "OCC333: Superimposed curves during intersection two surfaces "
 puts "================"
 puts ""
-#######################################################
-## Superimposed curves during intersection two surfaces 
-#######################################################
 
-pload QAcommands
+set GoodNbCurv 14
 
-restore [locate_data_file OCC333a.draw] s12 
-############### checkshape su12 # is not a topological shape
-restore [locate_data_file OCC333b.draw] s11
-############### checkshape su11 # is not a topological shape
-intersect result s12 s11
-explode result e
-clknots result_3
-clknots result_13
+restore [locate_data_file OCC333a.draw] s1 
+restore [locate_data_file OCC333b.draw] s2
 
-mkedge e_1 result_3
-mkedge e_2 result_13
+intersect result s1 s2
 
-set status [OCC333 e_1 e_2]
-if {[llength ${status}] < 1} {
-    puts "OCC333 ERROR"
-} else {
-    regexp {([-0-9.+eE]+)} ${status} full code
-    if { ${code} == 3 || ${code} == 2} {
-	puts "OCC333 OK  : Intersection command works properly"
-    } else {
-	puts "Faulty OCC333 : Intersection was made WRONGLY"
-    }
+set che [whatis result]
+set ind [string first "3d curve" $che]
+if {${ind} >= 0} {
+  #Only variable "result" exists
+  renamevar result result_1
 }
 
-donly i_3 i_13
+set ic 1
+set AllowRepeate 1
+while { $AllowRepeate != 0 } {
+  set che [whatis result_$ic]
+  set ind [string first "3d curve" $che]
+  if {${ind} < 0} {
+    set AllowRepeate 0
+  } else {
+    display result_$ic
+    
+    bounds result_$ic U1 U2
+    
+    dump U1 U2
+    
+    if {[dval U2-U1] < 1.0e-9} {
+      puts "Error: Wrong curve's range!"
+    }
+    
+    xdistcs result_$ic s1 U1 U2 10 2.0e-7
+    xdistcs result_$ic s2 U1 U2 10 2.0e-7
+    
+    for { set ip [expr $ic-1] } { $ip > 0 } { incr ip -1 } {
+      mkedge e1 result_$ic
+      mkedge e2 result_$ip
+
+      set coe [checkoverlapedges e1 e2 5.0e-5]
+
+      puts "result_$ic <-> result_$ip: $coe"
+      if { [regexp "Edges is not overlaped" $coe] != 1 } {
+        puts "Error: result_$ic and result_$ip are overlaped"
+      }
+    }
+     
+    incr ic
+  }
+}
+
+incr ic -1
+
+if {$ic == $GoodNbCurv} {
+  puts "OK: Number of curves is good!"
+} else {
+  puts "Error: $GoodNbCurv curves are expected but $ic ones are found!"
+}
+
+smallview
+don result*
+fit
+clear
+don s1 s2 result*
+
+checkview -screenshot -2d -path ${imagedir}/${test_image}.png
 
-checkview -display result -2d -path ${imagedir}/${test_image}.png
diff --git a/tests/bugs/moddata_2/bug567 b/tests/bugs/moddata_2/bug567
deleted file mode 100755
index d6f396f2ea..0000000000
--- a/tests/bugs/moddata_2/bug567
+++ /dev/null
@@ -1,62 +0,0 @@
-puts "TODO OCC12345 ALL: Faulty OCC565: function intersection works wrongly with trimmed Surfaces"
-puts "TODO OCC12345 Linux: Faulty OCC565: function intersection works wrongly with infinite Surfaces"
-puts "TODO OCC12345 MacOS: Faulty OCC565: function intersection works wrongly with infinite Surfaces"
-
-puts "========"
-puts "OCC567"
-puts "========"
-puts ""
-#######################################
-## Can not intersect two Rectangular Trimmed Surfaces . 
-#######################################
-
-restore [locate_data_file OCC567a.draw] s1 
-restore [locate_data_file OCC567b.draw] s2 
-
-if { [checkplatform -windows] }  {
-   puts "OS = Windows NT"
-   set N_repeat 10
-} else {
-   puts "OS = Linux"
-   set N_repeat 11
-}
-
-if { [catch {intersect i s1 s2 } catch_result] } {
-    puts "Faulty OCC565: function intersection works wrongly with infinite Surfaces"
-} else {
-   set j 1
-   repeat ${N_repeat} {
-   set err [lindex [whatis i_$j] 5]
-     if { $err != "curve"} {
-       puts " Faulty OCC565: function intersection works wrongly with infinite Surfaces"
-       break
-      } else {
-       puts [format "%s ) OCC565 OK: function intersection works with infinite Surfaces" $j]
-              }
-    incr j}
-}
-
-trim s1x s1 0 2*pi 0 2*pi/13
-trim s2x s2 0 2*pi 0 2*pi/13
-
-if { [catch {intersect result s1x s2x } catch_result] } {
-    puts "Faulty OCC565 exception: function intersection works wrongly with trimmed Surfaces"
-} else {
-    set nom 0
-    set j 1
-    repeat 11 {
-	set err [lindex [whatis result_$j] 5]
-        if { $err != "curve"} {
-    	    break
-        } else {
-    	    set nom [expr $nom + 1]
-        }
-	incr j
-    }
-    if { $nom == 0} {
-	puts "Faulty OCC565: function intersection works wrongly with trimmed Surfaces"
-    } else {
-	puts " OCC565 OK: function intersection works with trimmed Surfaces"
-    }
-}
-
diff --git a/tests/bugs/moddata_2/bug567_1 b/tests/bugs/moddata_2/bug567_1
new file mode 100644
index 0000000000..223b72581c
--- /dev/null
+++ b/tests/bugs/moddata_2/bug567_1
@@ -0,0 +1,94 @@
+puts "========"
+puts "OCC567: Can not intersect two Rectangular Trimmed Surfaces ."
+puts "========"
+puts ""
+
+# Different result between Debian 7 and Debian 8 and between MSVC 2010 and 2017.
+puts "TODO ?OCC30012 Linux: Error: 10 curves are expected but 9 ones are found."
+puts "TODO ?OCC30012 Linux: Error: 10 curves are expected but 8 ones are found."
+puts "TODO ?OCC29910 Windows: Error: 10 curves are expected but 11 ones are found."
+puts "TODO ?OCC29910 Windows: Error :  is WRONG because number of EDGE entities in shape \"rs\" is 15"
+puts "TODO ?OCC29910 Linux: Error :  is WRONG because number of EDGE entities in shape \"rs\" is 8"
+puts "TODO ?OCC29910 Windows: Error: 0 vertices are expected but 2 are found"
+
+set GoodNbCurves 10
+
+foreach a [directory res*] {unset $a}
+
+restore [locate_data_file OCC567a.draw] s1 
+restore [locate_data_file OCC567b.draw] s2 
+
+if { [catch {intersect res s1 s2 } catch_result] } {
+    puts "Faulty OCC567: function intersection works wrongly with infinite Surfaces"
+} else {
+  set che [whatis res]
+  set ind [string first "3d curve" $che]
+  if {${ind} >= 0} {
+    #Only variable "res" exists
+    renamevar res res_1
+  }
+
+  bclearobjects
+  bcleartools
+  
+  set ic 1
+  set AllowRepeat 1
+  while { $AllowRepeat != 0 } {
+    set che [whatis res_$ic]
+    set ind [string first "3d curve" $che]
+    if {${ind} < 0} {
+      set AllowRepeat 0
+    } else {
+     
+      bounds res_$ic U1 U2
+      
+      if {[dval U2-U1] < 1.0e-9} {
+        puts "Error: Wrong curve's range!"
+      }
+      
+      xdistcs res_$ic s1 U1 U2 100 2.0e-7
+      xdistcs res_$ic s2 U1 U2 100 2.0e-7
+      
+      for { set ip [expr $ic-1] } { $ip > 0 } { incr ip -1 } {
+        mkedge e1 res_$ic
+        mkedge e2 res_$ip
+
+        set coe [checkoverlapedges e1 e2 5.0e-5]
+
+        puts "res_$ic <-> res_$ip: $coe"
+        if { [regexp "Edges is not overlaped" $coe] != 1 } {
+          puts "Error: res_$ic and res_$ip are overlaped"
+        }
+      }
+      
+      mkedge ee res_$ic
+      baddobjects ee
+      
+      incr ic
+    }
+  }
+
+  incr ic -1
+  
+  if {$ic != $GoodNbCurves} {
+    puts "Error: $GoodNbCurves curves are expected but $ic ones are found."
+  }
+  
+  if {$ic != 1} {
+    # Check of gaps between intersection curves
+    bfillds
+    bbuild rs
+
+    checknbshapes rs -edge 14
+    checksection rs -r 0
+  }
+}
+
+smallview
+don res_*
+
+fit
+don s1 s2
+disp res_*
+
+checkview -screenshot -2d -path ${imagedir}/${test_image}.png
diff --git a/tests/bugs/moddata_2/bug567_2 b/tests/bugs/moddata_2/bug567_2
new file mode 100644
index 0000000000..21286d553b
--- /dev/null
+++ b/tests/bugs/moddata_2/bug567_2
@@ -0,0 +1,89 @@
+puts "========"
+puts "OCC567: Can not intersect two Rectangular Trimmed Surfaces ."
+puts "========"
+puts ""
+
+set GoodNbCurves 1
+
+restore [locate_data_file OCC567a.draw] s1 
+restore [locate_data_file OCC567b.draw] s2 
+
+foreach a [directory res*] {unset $a}
+
+trim s1x s1 0 2*pi 0 2*pi/13
+trim s2x s2 0 2*pi 0 2*pi/13
+
+if { [catch {intersect res s1x s2x } catch_result] } {
+    puts "Faulty OCC565 exception: function intersection works wrongly with trimmed Surfaces"
+} else {
+  set che [whatis res]
+  set ind [string first "3d curve" $che]
+  if {${ind} >= 0} {
+    #Only variable "res" exists
+    renamevar res res_1
+  }
+
+  bclearobjects
+  bcleartools
+  
+  set ic 1
+  set AllowRepeat 1
+  while { $AllowRepeat != 0 } {
+    set che [whatis res_$ic]
+    set ind [string first "3d curve" $che]
+    if {${ind} < 0} {
+      set AllowRepeat 0
+    } else {
+     
+      bounds res_$ic U1 U2
+      
+      if {[dval U2-U1] < 1.0e-9} {
+        puts "Error: Wrong curve's range!"
+      }
+      
+      xdistcs res_$ic s1 U1 U2 100 2.0e-7
+      xdistcs res_$ic s2 U1 U2 100 2.0e-7
+      
+      for { set ip [expr $ic-1] } { $ip > 0 } { incr ip -1 } {
+        mkedge e1 res_$ic
+        mkedge e2 res_$ip
+
+        set coe [checkoverlapedges e1 e2 5.0e-5]
+
+        puts "res_$ic <-> res_$ip: $coe"
+        if { [regexp "Edges is not overlaped" $coe] != 1 } {
+          puts "Error: res_$ic and res_$ip are overlaped"
+        }
+      }
+      
+      mkedge ee res_$ic
+      baddobjects ee
+      
+      incr ic
+    }
+  }
+
+  incr ic -1
+  
+  if {$ic != $GoodNbCurves} {
+    puts "Error: $GoodNbCurves curves are expected but $ic ones are found."
+  }
+  
+  if {$ic != 1} {
+    # Check of gaps between intersection curves
+    bfillds
+    bbuild rs
+  
+    checknbshapes rs -edge 1
+    checksection rs -r 2
+  }
+}
+
+smallview
+don res_*
+
+fit
+don s1 s2
+disp res_*
+
+checkview -screenshot -2d -path ${imagedir}/${test_image}.png