So I went to the 'Main Series' section of the forums, checked to see what was happening in Hoen, and nothing caught my eye. So I clicked the link to go back to the list of just the Main Series, and an error page popped up- it said something like style not found. I reloded, went back and tried again- nothing. This was the URL at the top of the error page- http://www.psypokes.com/forums/viewforum.php?f=55
EDIT: Happens when going to the Main Series from anything- Kanto, Johto, Hoen, Sevii, Sinnoh, Sinjoh, and Unova.