I'll explain later...
Ok - sometime on Saturday/Sunday, my host informed me that the server that this forum's database is on went down. Today, I found out that the last usable backup is from 8/9. Unfortunately, this means that all posts from 8/9 until 9/17 are lost. I'm really sorry about this, I've never had this problem with a host before.
In the meantime, I'm doing daily backups myself