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

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