@rondilly I was eager to test your solution, but it does the opposite of what you propose. It will make it so ONLY BANNED DOMAINS can register. Essentially, you are defining limited domains (“If you want to limit blog registrations to certain domains.”) with the banned email domain list.
I tried to update my personal avatar and had the same result as with with uploading the group avatar — Safari locked up in perpetual beachball-ed-ness.
Safari Version 4.0.3 (6531.9)
When I tried to update a group avatar using Firefox, instead of a broken link, it states “No Group Avatar” and again the text: “Upload an image to use as an avatar for this group. The image will be shown on the main group page, and in search results.” and again there are no buttons or links presented to upload an image.
However, Firefox *does* let me upload a new personal avatar.