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I recently created an SDI (no doc/view) app in Visual Studio 2005. I added a couple of CExtControlBar and everything worked fine. However, recently, the application will hang whenever I attempt to resize a floating control bar or if I am using the Visual Studio 2005 theme, then it will hang whenever I undock the control bar(s). Note: it doesn’t hang until a second or two after undocking or resizing the control bar.

If I break the debugger, I can see that the code appears stuck in a loop inside void CExtPaintManager::stat_PassPaintMessages. Specifically it is looping in this section of code
if( bPassPaint )
    {
        while( ::PeekMessage( &msg, NULL, WM_PAINT, WM_PAINT, PM_NOREMOVE ) )
        {
            if( ! ::GetMessage( &msg, NULL, WM_PAINT, WM_PAINT ) )
                break;
            ::DispatchMessage( &msg );
        } // while( ::PeekMessage( &msg, NULL, WM_PAINT, WM_PAINT, PM_NOREMOVE ) )
    }

I was wondering if anyone had any ideas as to where to begin looking or whether I accidently did something horribly wrong. Thanks.

Fixed the problem. On my apps main child window, I had removed the line "CPaintDC dc(this);" from the paint function. Added that back and all is well.