I got the following error again today, Dec. 23, 2013 @ 7:43am. I was trying to switch from one of the forums back to General forums when it occurred....
Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator, email@example.com
and inform them of the time the error occurred, and anything you might have done that may have caused the error.
More information about this error may be available in the server error log.