Umm, I'm not sure if it's the same issue, but recently all user rights for every single user in the user library (including the admin) went missing much like yours. I know for a fact that my user profile had admin rights, but at that time, no rights were checked for any user. (The admin user will have, if I'm correct, all the rights selected).
I still don't know what caused the issue, but a simple restart of the server that hosts RoboSource Control was enough to restore permissions in our case. Maybe you could try that and see if the restart helps? Considering that the alternative is setting up a new RSC database, I would think it's worth a shot
Well, it was definitely worth a try. Didn't work...but I'm still resisting the alternative. Thanks for the idea Richa.