GeomPlate_MakeApprox crashes on Windows 7 (x64)

Hi all!
I moved from Windows XP 64 bit to Windows 7 64 bit. On the new system the application crashes inside GeomPlate_MakeApprox ctor while it was running fine on Windows XP.

My current setup is:
OS: Windows 7 Enterprise, 6.1.7601 ServicePack 1.0
OCC: 6.5.1
compiler: VC10
build: OCC (and all other libs) built from source as x64 debug

Basically OCC seems to work. I can start the application; displaying points and lines works fine. When I try to fit a NURBS surface to a point cloud (nothing fancy, more or less copy-and-paste from the examples...) the constructor of GeomPlate_MakeApprox crashes. Stack trace attached below.

The actual reason for the crash is in macrgfl_ (AdvApp2Var_SysBase.cxx) where an array index (ioff) is calculated as 58412015, which seems to be out of bound. Although I think the root cause is somewhere upsteam. (E.g. iadt=-310073424 which also looks strange for an index.)

The code may not be optimal but it works (with identical input parameters) on Windows XP 64 bit.

> Does anyone use GeomPlate_MakeApprox successfully on Windows 7 x64?
> Any ideas how to solve this issue?

Many thanks, Dietmar

**** code snippet
...
Standard_Integer Degree = 3;
Standard_Integer NbPtsOnCur = 10;
Standard_Integer NbIter = 3;
Standard_Integer Order = 0;
Standard_Integer MaxSeg = 9;
Standard_Integer MaxDegree = 5;
Standard_Real anApproxTol = 0.001;
Standard_Real aConstrTol = Precision::Confusion();

// define object BuildPlateSurface
GeomPlate_BuildPlateSurface BPSurf(Degree, NbPtsOnCur, NbIter);
// add point constraints to GeomPlate_BuildPlateSurface object
for(int i(0); i BPSurf.Add(new GeomPlate_PointConstraint(
gp_Pnt(cloudPoints[i].getPoint().x, cloudPoints[i].getPoint().y, cloudPoints[i].getPoint().z),
Order, aConstrTol));
BPSurf.Perform();
// make PlateSurface
Handle(GeomPlate_Surface) plateSurf;
// Handle(Geom_Surface) aSurf; is memeber now
if(BPSurf.IsDone())
{
plateSurf = BPSurf.Surface();
// define parameter approximation
Standard_Real dmax(Max(0.01, 10*BPSurf.G0Error()));
// make approximation
GeomPlate_MakeApprox approx(plateSurf, anApproxTol, MaxSeg, MaxDegree, dmax);
...

**** stack trace
> TKGeomBase.dll!macrgfl_(long * iadfld, long * iadflf, int * iphase, int * iznuti) Zeile 926 + 0x16 Bytes C++
TKGeomBase.dll!AdvApp2Var_SysBase::mcrrqst_(int * iunit, int * isize, double * t, long * iofset, int * iercod) Zeile 3324 C++
TKGeomBase.dll!AdvApp2Var_ApproxF2var::mma2fnc_(int * ndimen, int * nbsesp, int * ndimse, double * uvfonc, void (int *, double *, double *, int *, double *, int *, double *, int *, int *, double *, int *)* foncnp, double * tconst, int * isofav, int * nbroot, double * rootlg, int * iordre, int * ideriv, int * ndgjac, int * nbcrmx, int * ncflim, double * epsapr, int * ncoeff, double * courbe, int * nbcrbe, double * somtab, double * diftab, double * contr1, double * contr2, double * tabdec, double * errmax, double * errmoy, int * iercod) Zeile 6775 C++
TKGeomBase.dll!AdvApp2Var_Iso::MakeApprox(const AdvApp2Var_Context & Conditions, const double U0, const double U1, const double V0, const double V1, void (int *, double *, double *, int *, double *, int *, double *, int *, int *, double *, int *)* const & Func, AdvApp2Var_Node & NodeBegin, AdvApp2Var_Node & NodeEnd) Zeile 275 C++
TKGeomBase.dll!AdvApp2Var_ApproxAFunc2Var::ComputeConstraints(const AdvApprox_Cutting & UChoice, const AdvApprox_Cutting & VChoice, void (int *, double *, double *, int *, double *, int *, double *, int *, int *, double *, int *)* const & Func, const AdvApp2Var_Criterion & Crit) Zeile 661 C++
TKGeomBase.dll!AdvApp2Var_ApproxAFunc2Var::ComputePatches(const AdvApprox_Cutting & UChoice, const AdvApprox_Cutting & VChoice, void (int *, double *, double *, int *, double *, int *, double *, int *, int *, double *, int *)* const & Func, const AdvApp2Var_Criterion & Crit) Zeile 449 C++
TKGeomBase.dll!AdvApp2Var_ApproxAFunc2Var::Perform(const AdvApprox_Cutting & UChoice, const AdvApprox_Cutting & VChoice, void (int *, double *, double *, int *, double *, int *, double *, int *, int *, double *, int *)* const & Func, const AdvApp2Var_Criterion & Crit) Zeile 332 C++
TKGeomBase.dll!AdvApp2Var_ApproxAFunc2Var::AdvApp2Var_ApproxAFunc2Var(const int Num1DSS, const int Num2DSS, const int Num3DSS, const Handle_TColStd_HArray1OfReal & OneDTol, const Handle_TColStd_HArray1OfReal & TwoDTol, const Handle_TColStd_HArray1OfReal & ThreeDTol, const Handle_TColStd_HArray2OfReal & OneDTolFr, const Handle_TColStd_HArray2OfReal & TwoDTolFr, const Handle_TColStd_HArray2OfReal & ThreeDTolFr, const double FirstInU, const double LastInU, const double FirstInV, const double LastInV, GeomAbs_IsoType FavorIso, GeomAbs_Shape ContInU, GeomAbs_Shape ContInV, const int PrecisCode, const int MaxDegInU, const int MaxDegInV, const int MaxPatch, void (int *, double *, double *, int *, double *, int *, double *, int *, int *, double *, int *)* const & Func, const AdvApp2Var_Criterion & Crit, AdvApprox_Cutting & UChoice, AdvApprox_Cutting & VChoice) Zeile 161 C++
TKGeomAlgo.dll!GeomPlate_MakeApprox::GeomPlate_MakeApprox(const Handle_GeomPlate_Surface & SurfPlate, const double Tol3d, const int Nbmax, const int dgmax, const double dmax, const int CritOrder, GeomAbs_Shape Continuity, const double EnlargeCoeff) Zeile 401 + 0x14a Bytes C++