Just thought I'd pass this along as a data point and you guys can do with it what you will.

The last two or three days, I've had issues where, while I'm reading the forums and basically making a thread "read" by me, I'll then hit the "What's New" button, and the same bunch of threads will be marked as unread and start me over from the beginning. What's weird is they don't ever reset during my session AND it's not all threads, but just random ones.

This seems to be a new occurrence, and I can't completely discount FF being the issue, but thought I'd pass it along.