Color troubles with applications based on GTK+ (I think so)

Hello everybody,

My girlfriend tried to learn linux through my computer. She said she modified nothing at all. But from this time I have some troubles with my menu in applications using GTK+. In fact I think so.

I’m using OpenSUSE for a while, but really unable to found a solution.

Please consider the screenshot.
http://img121.imageshack.us/img121/222/gtkpb.png