I wiped my HD and reinstalled LION from scratch. Did not upgrade back to Mountain Lion. Works now! I'm afraid to upgrade back up to Mnt lion fearing that it may stop working again. Probably not but I'm happy in Lion and a working Aperture.
Currently Being ModeratedOct 5, 2012 2:56 PM (in response to Jeremy Prewitt)
Well, if you have an external drive, or a partition with some extra space on it, you could back up your drive with Disk Utility (this article is for 10.5/10.6, but Disk Utility works the same way in newer OSes).
Then you can upgrade to Mountain Lion again. If it doesn't work, you can always roll back.