I've had the Unread Content set according to this for as long as I've had the forum running:

As you can see, after upgrading to 4.4.2 it is no longer displaying anything even though there are new replies to view on the forum. I'm not sure why this is the case because it worked perfectly fine right up to version 4.3.6 when set this way.

Any idea why this might be or does this need to be raised with official support as a bug?

If you login anonymously, "unread content since my last visit" may not work accurately. You can either (1) not login anonymously or (2) stop limiting the feed by "since my last visit".

We are looking into a solution for this concern in an upcoming maintenance release.

Ok, thanks. That's what I normally do is log in anonymously so that explains why it's not working. Hopefully a solution isn't too difficult to come to.