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 Desktop Packages, 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 Status in “gnome-system-monitor” package in Ubuntu: Invalid Bug description: Gnome-system-monitor 3.20 becomes unresponsive when I switch to the Processes tab. Any other tab works. This is reproducible as it happens every time. The app does not crash but seems to hang in a loop. I am running Oneiric x64 ProblemType: Bug DistroRelease: Ubuntu 11.10 Package: gnome-system-monitor 3.2.0-0ubuntu1 ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4 Uname: Linux 3.0.0-12-generic x86_64 NonfreeKernelModules: nvidia ApportVersion: 1.23-0ubuntu3 Architecture: amd64 Date: Wed Oct 26 07:03:31 2011 ExecutablePath: /usr/bin/gnome-system-monitor InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha amd64 (20110804) SourcePackage: gnome-system-monitor UpgradeStatus: Upgraded to oneiric on 2011-09-11 (44 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-system-monitor/+bug/881955/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp