OpenCascade QT crash

Hello,
I'm trying to start using OCC for my QT projects.
I download and rebuild OCC 6.5.3 under Win7 x64 and VS2010, all was fine, then compile and run MFC samples, they build and run fine too.
Now trying to create a simple QT project under VS2010, when I creating WNT_GraphicDevice object code is work:

Handle_WNT_GraphicDevice myGraphicDevice = new WNT_GraphicDevice();
// create the Viewer
TCollection_ExtendedString Name("Viewer 2D");
TCollection_AsciiString Domain("My Domain");
my2DViewer = new V2d_Viewer(myGraphicDevice, Name.ToExtString(), Domain.ToCString());
// set default values for grids
my2DViewer->SetCircularGridValues(0,0,10,8,0);
my2DViewer->SetRectangularGridValues(0,0,10,10,0);
//
myAISInteractiveContext2D = new AIS2D_InteractiveContext(my2DViewer);

but when I create Graphic3d_WNTGraphicDevice object, programm is crashing on NEW operator

Handle_Graphic3d_WNTGraphicDevice myGraphicDevice3D = new Graphic3d_WNTGraphicDevice();

file new.cpp

void *__CRTDECL operator new(size_t size) _THROW1(_STD bad_alloc)
{ // try to allocate size bytes
void *p;
>>>>>> while ((p = malloc(size)) == 0) if (_callnewh(size) == 0)
{ // report no memory
static const std::bad_alloc nomem;
_RAISE(nomem);
}

return (p);
}

why MFC samples work fine? where is error? how to configure QT project?
where I can find any tutorials for using OCC??
it's big and hard to learn.. =((