Your not the only one, is it happening to everyone in your buddy list?
For me its just a few of them that are blurry. I'm sure the next update will sort it out but I don't really know whats causing it. Im sure if Adium is storing the images somewhere you can just delete those and it'll resolve itself.
Need to find them first 😕
Update: Trying to regenerate the images doesn't seem to work, still blurry