For some time now I've not gotten notifications for new posts on forums that I have subscribed to, with some exceptions. Tonight I got about 20 notifications on new Cadillac News posts dating back to April 15. One of them was for replies to an old topic, the rest was for new topics.
I do get notifications for threads that I have posted to, or threads that I subscribe to. I've been relying on scanning the forms and boards for bold titles to spot new posts, when I have the time.