For those receiving PAGE NOT FOUND or 500 - SERVER ERROR messages:
Log out of RCU.
Clear your browser's history and cache.
Close your browser. If you are on a Windows computer create a Command prompt (Windows Key + r), and then type "cmd". In the command box type in "ipconfig/flushdns" and hit enter (this will flush your DNS cache). Now open back up your browser and try to log into RCU. If the new forums still don't pull up type ctrl + F5 to force a refresh on your browser.