Important fix for MATE ？ Feedback needed
http://blog.linuxmint.com/?p=1901

100% CPU usage with certain themes
Panel disappearing with certain themes
Notification daemon freezing with certain themes

How to test the fix?
Open the Update Manager
Click on “Edit”->”Software Sources”
Enable “Unstable packages (Romeo)”
Click on “Close”
Click on “Refresh”
Sort the list of updates by version number
Apply all updates which version is “2.24.6-0ubuntu5linuxmint1″

Once the updates are applied you will need to log out and log back in.