... Yes but the background of the button bar has the same problem too? If these toolbars have any alpha blending, transparencies or any similar options enabled by default (which are supported only by XP+), they may be the cause of this issue. Perhaps you could check the version of the underlying OS and disable such options in the button bar upon loading of Romcenter?
This is the right thing to do. I will disable all graphics features for win2k.