first off I'm using Theme My Login and have Themed Profile

first off I'm using Theme My Login and have Themed Profile enabled and I'm signed in as administrator on the main site. When I try to upload a photo as avatar on the main site I get an access restriction page (see screenshot). This doesn't happen when Theme Profile is disabled, or when I'm uploading avatar from the back end but ob viously that's not what I want. So why is wordpress restricting access to the avatar upload page, even for the administrator?