Forum forum.php not loading fully...
 

I'm not sure where to start with this problem.
We just upgraded to 4.0.2 - we were quite a few updates behind, and had just been hacked. After the upgrades forum.php does not fully load, but does not give any errors that I can see. It only loads the first forum piece, and only the first child forum below the main heading. The bottom/footer of the page is not loading.
Clicking on the link that does come up loads the section just fine. Using forumdisplay.php to type in the "number" of a forum (like www.fitnessboard.net/forumdisplay.php?7) will display that full section - so I know the database is there.

This is what it looks like when I click the "forum" tab:
http://www.ptaaron.com/forum.jpg

If I hit refresh it will display differently every few times I click refresh (I circled the areas that change):
http://www.ptaaron.com/forum1.jpg

http://www.ptaaron.com/forum2.jpg

http://www.ptaaron.com/forum3.jpg

http://www.ptaaron.com/forum4.jpg

and finally occasionally when it will load it comes up like this:

http://www.ptaaron.com/forum5.jpg

Going into an area via "forumdisplay.php" shows something more like it should:
http://www.ptaaron.com/forum6.jpg

I am not the main coder for the site - I am just trying to troubleshoot and figure out what I should be looking for. Any help or suggestions are appreciated.