I've had a couple of people ask me in conversation about this, and I've also noticed missing avatars in posts from people who normally display them (that image under your name on the left hand side of each post). Most of you probably know this by now, but just in case...
If you had been displaying an avatar and it mysteriously vanished without a trace recently, it's due to the forum upgrades. Apparently it reset some preferences in your profile to defaults. Here's what I did to turn mine back on:
Hope this helps.
- Click on the My Profile link
- Click on Edit Avatar on the left
- Select Use Custom Avatar (it was set to "do not use an avatar")
- Select Save Changes