Here's an odd low-priority bug. The automatic Talkback threads are messing with the "blue folder" new post indicators.
Like, just a little while ago, a new Talkback thread appeared, and then Infernal bumped up another thread. The new Talkback thread doesn't appear as a blue folder, even though it was new. But more than that, on the main "Forums" page it indicated that there were no new "blue folder" posts at all in the Talkback forum, not even Infernal's post.
It still said Infernal's post was the newest one, but it wouldn't give it a blue folder. Not until you entered the Talkback forum and saw it without it having been lumped in with Blue-proof PGC NewsBot post. This is different from last night when it said the newest post in Talkback was from sometime last April.
Edit: I just went back in time to November 2004, and posted in Talkback. Take that, McFly!