Maybe y'all can give me some ideas as to what the problem could be.
I didn't change anything. But, some of my users are getting 403 forbiddens on newreply.php and newthread.php SOME of the time. They can post in some forums and not others.
I am getting them every time. I can't post and I can't change my templates. (I tried to change the header to tell the members to stop posting messages telling me that they can't post

)
I also can't use the pm system. Everything is coming up 403.
The file permissions seem fine. And, as I said, some people can post some of the time.
No new hacks installed today. This happened while I was at work.
Any ideas?