Try editing the admin/Config/Data.pm file, and look for 'debug' - it should have a value of '0', but if you change it to '1' you ought to get a more detailed error message, which should help to track down the problem.
Jason Rhinelander
Gossamer Threads
jason@gossamer-threads.com
Jason Rhinelander
Gossamer Threads
jason@gossamer-threads.com