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I've been developing a WPF application using Windows Vista/7. During the testing phase I tried it on Windows XP (SP3) and noticed that all of the menus in the application, including the system context menus in textboxes appear to be transparent:

Transparent Menus

I don't think I did anything to "deserve" this kind of behavior - all of the menus in XAML don't have any styles applied or anything - just simple plain old menus. Also, this behavior is consistent across all windows in the application.

What could be causing this kind of behavior ?