When a menu is closed the parent window is only updated in the region of the menu after the close on Win7 64bit. I was able to fix the problem by invalidating the parent window after the menu window is hidden:
void fgDeactivateMenu( SFG_Window *window )
fgSetWindow ( parent_window ) ;
InvalidateRect( parent_window->Window.Handle, NULL, FALSE); // Adding this fixes the issue
Not sure if this is the best place to put the fix but hope you can add this in the appropriate way.
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