This is what I got back from my host company...
> I was just wondering if there were some permission changes that might
> have happened?
Nope, no changes.
Could be a table corruption? Can you check the database tables for a locked table?
> Is there anyway I can get access to my error logs to see if I can find
> the problem?
Nothing in the logs other than the odd page not found.
I'd say it's a table not being read from the DB.
...any clues as to the tables that could be in question?