"Debug Assertion failed" in debug mode

[hed]

I am having problem working in debug mode with QT 4.3.0
Release works fine
but when changing to debug mode i get on really innocent lines
"Debug Assertion failed"

this line for example:

dataPath.toStdWString().c_str();

dataPath.toStdWString().c_str();

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(used to be this line: CString searchPath = dataPath.toStdWString().c_str(); )

it failes on the destructor of the temporary string.
Has anyone ran into those problems?

tnx,
hed

here is the stack:

> MSVCR71D.dll!operator delete() + 0x99
MSVCP71D.dll!std::collate<unsigned short>::do_hash() + 0x2b0
MSVCP71D.dll!std::basic_string<unsigned short,std::char_traits<unsigned short>,std::allocator<unsigned short> >::_Tidy() + 0x58
MSVCP71D.dll!std::basic_string<unsigned short,std::char_traits<unsigned short>,std::allocator<unsigned short> >::~basic_string<unsigned short,std::char_traits<unsigned short>,std::allocator<unsigned short> >() + 0x13
HiroClient.exe!HiroRTLogic_PC_Specific:eleteObsoleteFiles() Line 101 C++
HiroClient.exe!HiroRTLogic_PC_Specific::BackSuppor tForOldVersions() Line 84 C++
HiroClient.exe!HiroRTLogic::Init(HiroCodecContaine r * container=0x00538eb0, bool bFromMoviePlayback=false) Line 41 C++
HiroClient.exe!CHiroClientApp::InitInstance() Line 181 + 0x4a C++
mfc71ud.dll!AfxWinMain(HINSTANCE__ * hInstance=0x00400000, HINSTANCE__ * hPrevInstance=0x00000000, wchar_t * lpCmdLine=0x00020c70, int nCmdShow=1) Line 39 + 0xb C++
HiroClient.exe!wWinMain(HINSTANCE__ * hInstance=0x00400000, HINSTANCE__ * hPrevInstance=0x00000000, wchar_t * lpCmdLine=0x00020c70, int nCmdShow=1) Line 25 C++
HiroClient.exe!wWinMainCRTStartup() Line 390 + 0x39 C
kernel32.dll!RegisterWaitForInputIdle() + 0x49