The most frustrating thing I'm discovering about the new forum design is that the links for the different threads are coming up as "unviewed" frequently (I have Chrome set to change viewed links to red), when in the past they didn't. They would stay viewed, so that I could tell what things were new and what things I'd already looked at. It's making it much harder for me to browse the forum.
I also hate the fact that the timestamps are no longer showing up in 24 hour format, and there's no way in the forum preferences to change that. I have the same complaint about the fact that anything posted within the last hour will say "X minutes ago" instead of the time, so that if you refresh it doesn't give a baseline to go by.
I remember sending a lot of feedback about the new design when it was first presented, and I feel like everything I complained about in terms of usability was ignored. If some of the glitches don't get resolved, I don't think I'll bother spending much time here anymore.