I've never experienced this before, but when I upgraded to ubuntu 11.10 64 bit I got the same problem. The hard drive is filled up with .xsession-errors which makes it difficult to use the machine for anything useful after a few hours! Hope someone can fix this soon..
the errors I get in the xsession-errors file is (nautilus:6232): GLib- GObject-CRITICAL **: g_value_get_object: assertion `G_VALUE_HOLDS_OBJECT (value)' failed -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/589275 Title: client application error messages fill up disk in .xsession-errors To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/589275/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp