Oh Marty, can you please remove the 'Show your signature' option in Quick Reply? Or at least modify it in such a way that after typing my message, if I press 'tab', the focus should go to the 'Post Quick Reply' instead of the 'Show your sig' option.
It was the same error that appeared again, a crashed database table was flooding the mysql server.
Anyway, last time I repaired it and that worked for a couple of days until it crashed again. This time I have disabled it completely so it shouldn't happen again (crosses fingers).