I am having a similar problem on Aditi. It is only happening to my primary avi. Every time I log on, I get the message: "You cannot remove protected categories." I can't see anything in my inventory that might prompt this. PLUS my avatar is invisible, including my body, my skin, and my clothing. All attachments are visible, however. I've tried putting on a complete SL avatar, replacing it with a simple outfit, uploading new textures while in Aditi, disabling hardware skinning, etc., etc., all to no avail. This behavior seems to be confined to just my Zann Canto avatar. My alts all seem to work normally. I'm guessing there's some glitch unique to this one avatar, so (having gone through all the bug reports I can find), I'm contacting support. However, if anyone has any brilliant suggestions, I'm listening.
P.S. Almost forgot. When I try to change my appearance, the screen does not display properly. See third image below