Because no one ever tells me when something goes wrong, the avatar resizer has been broken for at least a week, and I didn't know about it. So, if you tried to upload an avatar in the last week or two (I know quite a few people were affected by this), and it didn't work, try again, it should be fine now.
And, while it never seems to help, I'll repeat this anyway:
If you're having a problem, and you don't tell me about it, I won't know to fix it!!!
Seriously people, if you have even the slightest suspicion that something is broken or not working properly, contact an admin. Especially me, since I'm the one who fixes code-stuff and runs the server, and I'm not exactly hard to get ahold of.