severity 689651 grave thanks The problem keeps coming back. It can be seen, when switching users (gdm). Now the message reports: [161136.118792] gnome-shell[12264]: segfault at 3c00000018 ip 00007f0d546386c5 sp 00007fffd641ec48 error 4 in libgio-2.0.so.0.3200.3[7f0d54601000+14b000] This makes wheezy hardly usable with multiple users. thanks