Hi everyone, I recently installed openSUSE 11.4 on my computer and laptop (both 64bit via dvd, one has AMD CPU and nVidia gpu, the other has intel cpu and graphics card). The problem is that when I move my mouse on close and minimize and maximize buttons of windows sometimes they aren't rendered correctly, and KDE menues aren't rendered correctly either, they mix with the background somehow. the menu problem goes away if I change the theme to plastik, but the window problem remains, here are links to some picture of what goes wrong in my system:

request download ticket | ifile.it
request download ticket | ifile.it
request download ticket | ifile.it

btw sorry that I uploaded them in ifile.it server, the other picture upload site like tinypic are blocked in my country.

Does anybody have any suggestions?

PS: Enabling or disabling desktop effects has no effect on the problem.