phpBB Problem and Solution

The PrestoSoft forum was down today, and displayed this error message:

phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1016 Can't open file: 'phpbb_sessions.MYI'. (errno: 145)

After doing a bit of googling, I found this page, which gives a simple solution: run the SQL script REPAIR TABLE phpbb_sessions. You can also try this for any other SQL table that doesn't work properly - chances are, it has a small error that can be fixed by REPAIRing it.