I have been running the development version of CF8 successfully on Apache/MacOSX for over 2 years, and suddenly it won't start anymore.  At the terminal window I enter sudo /Applications/Coldfusion8/bin/coldfusion start.  I get a message saying the CF server has started, but when I try to run an app or use the CF Administrator, I get the following message, as if the server were not running.

Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.