But... this isn't actually "number of threads since last visit" - not in the same way that C+ did it. I'm not saying that it should be just because C+ was that way - but in my most limited experience, if I were to click on it now, and peruse the threads, then reclick on it in an hour's time, I would expect to see only threads posted in that hour - irrelevant of when I logged on.
I only mention this, as I often have C+ on in the background of my computer, but when waiting for it to do something, I check out C+. (Some SAP / excel stuff can spend 3-10 minutes thinking, which I tend to do say 5 times a day....)
However, if this is not the norm, then I can easily live with it, as it is!!