[ubuntu] Blender 2.63a Crashes instantly on startup

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http://ubuntuforums.org – Hi guys, I installed blender 2.63a from ppa a few months ago and had no problem with it until yesterday. When I click on it's icon Blender opens it's windows ( I have two as I use dual screens ) and then it shuts down with a report window after. It's becoming very annoying as I have a project I need to get on with, and I've also used Blender for a while. Any idea's on what could be happening? More Info: Blender version: Blender 2.63a + svn50264 O/S: Ubuntu 12.04 LTS D/T Environment: Gnome 3.0 ( not that it makes much of a difference but it could be useful ). Thanks. J (Hardware)