Home page not displaying

Beginning yesterday, when I go to the home page, most of the features are missing. The top navigation bar, and left nav panel display normally, but the main content on the page is missing. The page is blank, no ads or other top threads, apart from the hottest topic tabs at the top of the page and navigation sections. All I can see is the "Hottest Topics right now section", but this only displays one topic "Texas school ...." (todays top choice). The remaining hottest topic tabs are shown, but hovering over them doesn't switch the content to display those, and once I've hovered over the tabs, this only topic I could see, vanishes.

I'm using firefox. I don't know if this is just my browser suddenly doing this, or if something was changed on the page and causing my browser to have viewing issues.

Thanks in advance if anyone can advise.

I noticed this as well, seems like some maintenance going on.