Same problem here. I have two ubb forums that went down yesterday AM for no reason. They have been up for years.

I'm been debugging for hours but can't find the issue.

Any ideas.

This is the error I'm getting in Apache's logs:
Quote
[Sat Oct 15 04:35:47 2011] [error] [client 74.120.12.135] File does not exist:
/web/vhosts/orbisvitae.com/htdocs/ubbthreads/
ubbthreads.php?ubb=showflat&Number=64072&ei=
ZyeZTs25DYq2lgfbr5DaBw&sa=t&ct=res&cd=49&
source=groups&usg=AFQjCNHwziv8LQa7fJ_-C4hW4wVt_oJ1KQ
[root@rtdns http]#


...yet the file DOES exist.


This is a link to the forum:

http://orbisvitae.com/ubbthreads/

Today they call you "crazy".
Tomorrow they call you "ahead of your time".