Yeah, I just don't get it, because I can see other people's avatars. I've even looked at the html code - and I'm not expert, but the call to the image doesn't appear in the code when my security is on, yet it does if I turn it off. I can see silver king's on this page, and most on the previous page of this thread, but not my own (and not yours if you are using one).
I might experiment and see if the house avatars work...