Are you getting a db error message when you try to reply to a message?
If so, I'm running a script to fix that right now. The reason is that we write messages as html and also put them into the db. Because we restored from a backup, recent posts weren't in the db, but the html remains.
When you try to reply, the system checks the db and throws an error if the data isn't there. It's to check if a post got deleted while you were responding.
I just updated the script that parses messages and added the lost ones to the db, so you shouldn't see any more of those errors.
If so, let me know on AA or send me an email.