Don't have permission to change my signature...

[NeoVid]

I need to change my signature to credit the creator of my new avatar, but when I try to preview or save changes to my sig, I get a 403 Forbidden. That didn't happen when I changed the avatar, though...

[Keris]

I would imagine that it's the line of dashes.

Multiple dashes in a row has in the past caused problems when used in a signature, possibly tripping some security feature. Try reducing down to a single dash (or use a horizontal rule with 1 ).

[NeoVid]

Problem with really unexpected solution solved!