[ubuntu] Lockups with some gtk applications

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http://ubuntuforums.org – I'm experiencing random lockups with some GTK applications, and apparently with only those that use GTK+ 3.x, in 13.04. I upgraded to it yesterday, so I don't know if it is a result of the upgrade not transferring some setting or something. The lockups seem to be related (partly) to opening menu items, such as indicators, as the menus then turn white and the system becomes unresponsive to clicks. I also get a problem with Firefox Nightly, Plank (the dock), Gedit, Dconf Editor, etc - where they just freeze after running for a few minutes. (Hardware)