Vassilis, It doesn't seem so because of the latest gnome-panel installed. I have tried to reproduce it and it no longer crashes. So, I think its a fixed bug.
-- Crashes when right click->menu editor is opened. https://launchpad.net/bugs/56248 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs