I also had this problem since upgrading to raring. Removing libcanberra-gtk-module seems to fix it .
http://www.kubuntuforums.net/showthread.php?61492-GTK-apps-freeze-if- non-root-in-kubuntu- raring&s=0e5d9bbf40c525c061724e92e5659163&p=319050#post319050 ** Changed in: gtk+2.0 (Ubuntu) Status: Expired => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/666921 Title: (Kubuntu) GTK app freeze when some GUI feature is used To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gtk+2.0/+bug/666921/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
