On 14.04 the same: when I switch workspace in windows oftentimes it get stuck 
on workspace mode (where I see the 4 workspaces). The moust pointer becomes a 
hand and there is no way to switch back to normal mode. This seems to happen 
more if there are windows refreshing (e.g. a tail in some terminal window). I 
typically get out of this by kill -HUP <compiz> from Ctrl+Alt+F1
I could not get out of it disabling snapping windows because it said unity 
plugin requires.
VGA driver is fglrx proprietary

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https://bugs.launchpad.net/bugs/815996

Title:
  Desktop occasionally freezes/locks up when switching workspaces

Status in Compiz:
  Confirmed
Status in Compiz Main Plugins:
  Confirmed
Status in Compiz Desktop Wall Plugin:
  Confirmed
Status in compiz package in Ubuntu:
  Confirmed
Status in compiz-plugins-main package in Ubuntu:
  Confirmed

Bug description:
  I'm assuming the issue is related to Compiz, but I'm not 100% sure.
  When I'm switching workspaces, it occasionally locks up (becoming more
  frequent). Most of the time, I'm going from the current one down
  (Ctrl+Alt+Down Arrow), and it freezes mid slide. Typically, I'm able
  to correct things by backing out to a terminal then returning
  (Ctrl+Alt+F1, pause, Alt+F7), but sometimes when I return the dual
  screen setup acts as one large screen (windows are stretched to the
  full width of both screens) and many of the windows collect on the
  first workspace.

  
  Ubuntu 11.04 (Classic)
  All packages up-to-date.

  If there are any logs/etc that would be helpful, let me know.
  --- 
  Architecture: amd64
  CompizPlugins: 
[core,bailer,detection,composite,opengl,decor,grid,imgpng,snap,compiztoolbox,resize,place,regex,move,gnomecompat,animation,vpswitch,mousepoll,workarounds,session,expo,wall,ezoom,fade,switcher,scale]
  DistroCodename: natty
  DistroRelease: Ubuntu 11.04
  DistroVariant: ubuntu
  InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429)
  InstallationMedia_: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429)
  NonfreeKernelModules: nvidia
  Package: compiz 1:0.9.4+bzr20110606-0ubuntu1~natty2
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=en_US:en
   PATH=(custom, user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 2.6.38-10.46-generic 2.6.38.7
  ProcVersionSignature_: Ubuntu 2.6.38-10.46-generic 2.6.38.7
  Tags:  natty natty ubuntu
  Uname: Linux 2.6.38-10-generic x86_64
  UnreportableReason: Please work this issue through technical support channels 
first.
  UpgradeStatus: Upgraded to natty on 2011-05-02 (84 days ago)
  UserGroups: adm admin audio cdrom dialout dip fuse lpadmin netdev plugdev 
sambashare

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