Unfortunately, yesterday afternoon and evening I was away from my computer (prom dress shopping), so I didn't see the problem until late last night. I had planned to contact them when I got to work this morning, but it was fixed by the time I got here so I didn't call. Maybe in a few days I'll call or email and ask about it just to satisfy my curiosity, but I'm sure they're busy enough right now without me adding to it. Of course, if more problems occur I'll contact them right away - I'm hoping yesterday was the final fix, though!
My guess would be that whatever the issues were over the weekend required some kind of server replacement or upgrade and during that it affected the availability of our content. I'm guessing the index pages are different from the thread content pages and they migrated them differently, so that's why those were available when the content wasn't. Again, all just a guess.