Post view not updating

I've had a problem with my view of current posts in a topic not updating to the current post.

The example:

http://www.marsroverblog.com/discuss-165301-on-the-road-again-volume-4page8.html

The last post, #151, January 20, 2010 9:45 PM is all I see. On the Forum Menu, it shows that that last post is by Horton, Thu Jan 21, 2010 23:43 EDT. I know I've made a couple of posts since #151. In fact, my last post there was sort of a test post where I said "Pancams up at Exploratorium" and was able to see all the following posts once my "test post" made it to the thread. As I'm sure it would do if I made another test this morning.

I've refreshed the page, cleared my browser cache (IE6, I need to update...), cleared my cookies and cleared the History, but to no avail.

Ideas?

--Bill