Well, I think that's the Problem.
I used a amule.rpm build for SuSE9.1, downloaded directly from the amule-forum.
Oh, now there is a rpm for 9.0 and a corrosponding wxGTK avaiable... 8o
Ok, I'll update my SuSE and try again. I'll post my results (positive or negative) in a few days.
Thanks for your hint!
Kai