[shad]

I've subscribed to some threads and am mostly watching them in the user control panel. Since the new forum is used, they are being marked as unread all the time, although there aren't any new posts. 2 Days ago I've marked the whole forum as read, went to UCP and they were still bold=unread. Clicked at each of the thread and they were marked as read again. Yesterday two of them got new topics and have been marked as unread, which is correct. I haven't read them yesterday and wanted to do it now, but now all of the subscribed threads are marked as unread again, which is wrong.

edit:
Sorry, just noticed the "Cannot / will not fix" section in the third post of this thread

[...]
Subscription list- cannot mark read (post 48 111) (can't fix. mybb bug?)
[...]

Sounds similar to my description of the issue...