tightvnc not working

Hello

When I connect with vncviewer to my vncserver, running on openSUSE 12.1, I get the logon screen, but after logging in, the vncviewer crashes without any error message on the console, where it was started. I also did not find any error message in the messages file and the xinetd log. A view days ago it worked fine. Can anybody help me, getting this working again please?