I run a site in which posts are nearly purely image based, and images have been posted full size. After updated to 3.5 today, all of my images have been centered and turned into thumbnail sizes that link to the fullsize attachments.
You can see what I mean here: http://seriousfiver.com/2012-12-11-random-funny-photos-2
I'm looking to either fix this problem while staying as 3.5, or changing back to 3.4.2, but I'm not really sure how to do either. I'm concerned if I revert back to installing 3.4.2 I may break my site further (I do have a database backup just not certain what to do with it).
Any advice would be a huge help.