I'm experiencing the very same issue with Björn on FreeNX/Karmic/amd64. Unfortunately libxklavier (4.0-0ubuntu5) did not work for me. I'm willing to provide more information about my environment upon request.
As a workaround, as suggested in http://ubuntu-virginia.ubuntuforums.org/showthread.php?t=1236402 , put the following two lines into ~/.gtkrc-2.0 worked for me. gtk-theme-name="Human" gtk-icon-theme-name = "Human" -- The program 'gnome-settings-daemon' received an X Window System error. During on a FreeNX server suring a session. https://bugs.launchpad.net/bugs/409621 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs