That's interesting. My thoughts are that it may have to do with the number of practice runs we had porting the forum over - we had one done on the 13th/14th November. I am sure this will vanish after you have read all of the threads.Viewing last post from Forum works great, and fast. If I go to New Post and try last unread post from there I get back to 14 November.
Was it anything special happening back then?
Also I can end up in the beginning of a thread I know I've read earlier.
It's not a big deal though. I guess next time I will get to the first new post