I was thinking that might be it last night, but I just checked the tekkit version and you are right, tekkit is 0.5.2 now. I didnt know that tekkit updated itself without asking you @_@
Im going to go update the server now >.<
Edit//
Updated the server but now I get an error whenever I try to join. Would be very helpful if someone else could try logging on and tell me if they get an error page as well. Thanks!!