The threads below have not been updated since your last visit...

[John Coloccia]

...but still contain unread posts.

Can someone explain just what the heck this means? It's English, I think, and I even think it's grammatically correct, yet it makes absolutely no sense whatsoever to me. I read it over and over and over again, and I can't extract anything meaningful. Just what is it trying to tell me?

[Jason Beam]

There were posts prior to your last visit, you still haven't read them and there have been no new posts since your last visit. Therefore, the threads have not been updated since you last visited but still contain posts it doesn't think you have read yet :)