Hi Tom,
I was unable to upload an avatar image using Safari 5.0.2 for Windows. The same image uploaded correctly in Firefox. When I tried to upload in Safari, after selecting an image but before clicking Save it would often jump to the front page of the Macedition forums. Other times, it would go to the front page of my Control Center. In either case, the image was not uploaded. This isn't a high priority fix (for me), but I thought that I should let you know about it.