it seems that data to determine whether a post/thread is new or not is being stored on the device used to peruse the forums. Could the box be clicked to store that data on the server instead? It's possible. I view the forum on a few different devices and computers and whether something is new or not is dependent on whether I've looked at it on said device, rather than whether or not I've looked at it at all. It would make browsing much more efficient.