Stupid me just startet Nero through KDE Icon and ALT+F2 "Run command..". The result is the mentioned crash-bug. When starting through bash or xterm everything works fine, the bug has disappeared. Since my login-shell is the bash I thought that every app should source its configuration files. Tested the same Icon and ALT+F2 thing in XFCE with the very same results. KDE Version is 3.3.2, XFCE is 4.2.0, Xorg is 6.8.2.
Thanks for your help; I'll stick with the start from the shell till next release is ready for download. If you want further testing I'll continue to obey your orders Obi-Wan