This is bizarre - when I navigate backwards (e.g if I'm on a thread then hit back to go back to the list of active convos, for example) the list of threads will be those from a few days ago. If I hit refresh, it'll reload with the (correct) current ones.
I don't know if this is a MN problem or something wrong with my login. It catches me out as I'll be looking at what I think is the list of active convos wondering why it looks familiar.
Can you investigate MNHQ?