Unhandled exception with CXTPSkinManagerApiHook

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   Hi,

An application which uses the XTP CXTShellTreeCtrl class reproducible crashes with an unhandled exception

0xC015000F: The activation context being deactivated is not the most recently activated one.

when opening the Shell context menu on a folder in the tree, then selecting (for example) properties in the menu and closing the dialog with OK.
The crash happens inside the MFC, in 

BOOL AFXAPI AfxDeactivateActCtx(DWORD dwFlags, ULONG_PTR ulCookie)

with the following call stack:

     ntdll.dll!7c9431a0()     
     [Frames below may be incorrect and/or missing, no symbols loaded for ntdll.dll]    
     ntdll.dll!7c9431a0()     
     shell32.dll!7ca8fdd4()     
     shlwapi.dll!77f76f02()     
     kernel32.dll!7c80a69d()     
>    mfc80ud.dll!AfxDeactivateActCtx(unsigned long dwFlags=0, unsigned long ulCookie=337117186)  Line 245 + 0x17 bytes    C++
     mfc80ud.dll!AFX_MAINTAIN_STATE2::~AFX_MAINTAIN_STATE2()  Line 63 + 0xe bytes    C++
     ToolkitPro1110vc80UD.dll!CXTPSkinManagerApiHook::ThreadProcHook(void * lpThreadData=0x02912fd8)  Line 965 + 0x25 bytes    C++
     kernel32.dll!7c80b683()     
     ntdll.dll!7c919b3f()     
     ToolkitPro1110vc80UD.dll!CXTPControlToolbars::CreateToolbarMenu(CXTPCommandBar * pPopupBar=0x05040302, int nInsert=151521030, int nID=-989918454, int bAddCustomizeButton=1094912, int bBeginGroup=50528514)  Line 223 + 0x32 bytes    C++

What may be the reason? The application uses several worker threads, but only one user interface thread.