Calling CreateWindowEx in my project, and placing a breakpoint on the line, a tooltip pops up saying "The breakpoint will not be hit. No executable code is associated with this line. Possible causes include: preprocessor directives or compiler/linker optimizations."

This code is a part of a co-worker's movie widget code, and he's not had this issue. Nor have others, but I've also been doing a large scale code update (involving .dlls, which I'm new to). Anyway, does anyone have any clues how this could happen? I've not used any preprocessor directives to take the code out myself... I need this function so the widget has an hWnd to draw to...

I've seen that before. My best guess is that CreateWindowEx is actually a #define, to CreateWindowExW for Unicode builds or CreateWindowExA for MBCS builds. You could just call the original function directly and see what happens.

Good thought, but unfortunately that didn't work. Still out.