Am Thu, 27 Oct 2011 17:49:13 +1000 schrieb Mick email@example.com:
Following yet another update that has disabled user control of USB sticks, cameras, etc. and blocked user from shutting down from the desktop (in my case xfce4), I am at the end of my tether.
Remove ck-launch-session from your ~/.xinitrc again.
Change "exec ck-launch-session startxfce4" back to "exec startxfce4" and your user should be able to shut down from Xfce4 again. I don't know if this will fix your USB issues.