I see all avatars in IE, clear browser cache and do a hard refresh.
While we're here, noticed some annoying things about how user options are configured, I believe they're default settings in 2.0, and really shouldn't be:
- Returns to message index after post, should return to topic.
- PMs are shown all, should be displayed as conversation, most recent on top.
- Sent PMs are not saved by default, they should be.
These are Profile options, but most users don't know (or care) that they're there. They can be set for all members in Admin -> Current Theme -> Member Options. These are my personal preferences, I use them on my production forums to make life easier for my members.