A couple of things about the forums I noticed this morning:

1.  The messages sent to a user saying that their post has been approved is written in gray lettering on a gray background when receiving HTML-formatted e-mails.  This made me think they were all blank until I noticed a subtle color change, and "selected" the text to see what was there. 

2.  This morning I posted in three threads, then got three message deletion notifications, followed immediately by three post approval messages.  I went to the forums, and found my entire threads were gone.  Was this an accidental deletion, or were my threads removed on purpose?

Okay, thought I'd point that out...  The posts were not all that important, so no great loss.

I noticed a couple of weeks ago, when I attempted to "reject" a message it would not do anything.  I finally deleted the message, which worked.  The user posting the message got a reject message in their e-mail for each time I attempted to reject it, but the post was still there waiting to be moderated.

One other thing I noticed about the post accepted message is that the link in the line that says "Click here to go to the message board." does not work.  Here is the link from the message...

http://www.dotnetnuke.comdefault.aspx/?forumid=8&tabid=795&scope=post&threadid=4905#4905

Let me know if you still see those threads now.  I will investigate this further.  The statistics I will give a good look at shortly.  Do a count of how many users you have in your Forum_Users table.