It seems that since the UDN change, unread posts are weird. Anything over 15 minutes old is now marked as read, even if I haven’t visited for hours. Today, I’ve seen messages at 14 minutes that are unread, but 17 minute old ones are ‘read’ even though I’ve never read them.
Some of these forums move fast enough that the ‘unread’ feature is quite handy to keep track of what you haven’t seen yet.
It was happening to me a few weeks before the switch to UDN. Could be a DNS issue on their end.
There is tons of stuff weird since the “upgrade”… I have to login everytime I visit, I see almost no unread posts, messages I post are not always posted, I could go on… Hell yeah, and my nickname changes everytime 
And you’ve only got 1 post. Ouch. That’s really weird, man. Good luck. 
This problem usually happens to me once or twice a month.
I’m hoping that it happening this morning was a coincidence…
I just noticed I’ve got things this morning that are over 2 hours old and ‘unread’, and that’s how long ago I browsed the forum. does a happy dance
Edit: And now this time, -nothing- is unread. sigh
I was OK after the start of UDN, but since it has started, every time I visit the forum, threads over 15 minutes old are not showing as unread.
Same problem here.
If it’s a new forum setting/UDN related cache; please revert to how it was before. 15-30 mins unread makes the whole deal useless.
I get the same issue.
Case in point: This thread. I didn’t know it existed cause I don’t pay attention to unread… now I have to haha.