Problem with gtk apps in kde

Hi, I am a newbie to linux and have recently installed SuSE 8.1. I run it with KDE. Now, some applications start with totally screwed windows and no fonts (but they start). Some examples are Gimp, Ethereal, Gqview, Grip. As far as I understand these are gtk+ applications, So I thought I might be missing the correct libraries. But in the Software Install section of YaST2 both gtk+ and glib are installed. Is there maybe a problem with the path? maybe with the fonts? Although I doubt the latter. Gimp starts with a window that is ca. 1 1/2 screens high and 1/8 screen wide. Any suggestions ? Kostas