So on the day of iOS6 Apple also released the 3.4 update to Aperture and osX 10.8.2. It seems if you apply all these updates, Aperture first updates your library, and then quits every time you load it. Brilliant, gee thanks Apple. why bother with actually testing software, you wouldn’t want to dent the 100 billion you have in the bank. Anyway, apparently it is something to do with the Facebook account info held within Aperture, you can zero this out by runnning the following at the command line:
% defaults remove com.apple.Aperture AccountConfigurations
This worked for me but Aperture no longer knew about my Flickr, or Facebook accounts. At least I got my photos back. Between this and iOS6 maps, this isn’t a great week to own Apple products.