i tried to reproduce it in my test environment, but have no idea what could cause this, sorry
Normally the edit_raids_own and edit_raids_any permissions should only affect the “Members” Tab, but not the “Signup” Tab.
Maybe Taracque knows better what could cause the problem.
Did you tried signup on Signup part of the popup window?
Raid admin has an ability to signup any users (via popup windows). Please be sure, that you have a character that meets level, rank requirements, otherwise you can’t signup for a raid. Also you can’t signup for a raid which is expired.