A certain stages of my program execution only in the release build it causes and exception which I can't track down! They all occur with the same dialog class so I'[m thinking it's something I did (well duh!)
With a little bit of help from someone on the board I managed to construct some settings that allowed be to kinda debug the release build.
I get a first chance exception and then this from the Call Stack window:

CMapPtrToPtr::GetValueAt(const CMapPtrToPtr * const 0x000004be {CMapPtrToPtr}, void * 0x00000cf0) line 178 + 1 byte
COleControlContainer::AttachControlSite(COleControlContainer * const 0x000004be {COleControlContainer}, CWnd * 0x0065fc18 {CStatic hWnd=???}) line 444
MFC42! 5f45d118()
CWnd::FromHandle(HWND__ * 0x00000cf0) line 293
CWinThread::PreTranslateMessage(CWinThread * const 0x000004be {CWinThread h=??? proc=???}, tagMSG * 0x0041ba74 {msg=0x0000000f wp=0x00000000 lp=0x00000000}) line 673
CWinThread::PumpMessage(CWinThread * const 0x000004be {CWinThread h=??? proc=???}) line 841 + 17 bytes
CWnd::RunModalLoop(CWnd * const 0x000004be {CWnd hWnd=???}, unsigned long 1598103293) line 3478 + 12 bytes
CDialog:oModal(CDialog * const 0x000004be {CDialog hWnd=???}) line 540
MFC42! AfxGetResourceHandleCompat(void) + 4677 bytes
INET TIMER V2! AfxWinMain(struct HINSTANCE__ *,struct HINSTANCE__ *,char *,int) + 574 bytes
INET TIMER V2! _except_handler3 address 0x004130b2
KERNEL32! bffbfe14()

It then points to this function in the MFC code:

void* CMapPtrToPtr::GetValueAt(void* key) const
// find value (or return NULL -- NULL values not different as a result)
{
if (m_pHashTable == NULL)
return NULL;

UINT nHash = HashKey(key) % m_nHashTableSize;

// see if it exists
CAssoc* pAssoc;
for (pAssoc = m_pHashTable[nHash]; pAssoc != NULL; pAssoc = pAssoc->pNext)
{
if (pAssoc->key == key)
return pAssoc->value;
}
return NULL;
}


None of the code has anything to do with me so i can't tell what's causing it! Could the clues lye in that the hWnds and HInstances are all '???' ?
Just so you know this happens when the Dialog tries to send a message and move itself.

Thanks for any help - Zubair Khan