Comment 17 for bug 662503

Summary of workaround (credit: https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/631664/comments/10)
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Open 'CompizConfig Settings Manager'
Goto the 'Window Management' category
Open 'Place Windows' settings
Goto the 'Fixed Window Placement' tab
In the 'Windows with fixed positions' section, click on the 'New' button
In the 'Edit' dialog, add "title=Calendar" (no quotes) in the 'Positioned windows' box
Slide X and Y Positions all the way to the right
Check the 'Keep in Workarea' checkbox
Close
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If it doesn't work, try the fix in Dave's comment (two comments above this)