Based on the discussion from the comments, seems that the issue is related to xorg-edgers ppa packages, so this is not System Monitor related, thus I am closing this bug as Invalid.
** Changed in: gnome-system-monitor (Ubuntu) Status: Confirmed => Invalid -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-system-monitor in Ubuntu. https://bugs.launchpad.net/bugs/881955 Title: System monitor freezes up when switching to Processes tab To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-system-monitor/+bug/881955/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs