i have a server running opensuse 12.2
for remote administration i am running a persistent vnc session on the server with a user account.
however when i start yast within that session the window opens but shows only flat gray. same if i start dolphin in superuser mode.
the strange thing is when i activate standard, non persistent vnc remote administration and log in with the same user, i can start yast and use it just fine.

any ideas?

thx in advance
sol