I have noticed in recent days that at times some, but not all, avatars seem to randomly resize to approx 1/4 their normal size. It can be either my own avatar as 'User' or avatars on the various message posts. It doesnt resize all on a page, just some. It appears to be random.
It happens at home and work so doesnt seem to be PC specific. I dont recall it happening before. Not really a problem, just an observation.