Since I have returned from my 'time in the corner' (temp ban/time-out), I haven't been getting notifications to new posts in threads I was subscribed to.
It seems to work ok for virgin posts in a thread (meaning I had not posted in 'X-thread' before, or I started one), but for classics like 'Odd GIFs' for example, I get no notifications.
The thread icon shows that I am subscribed, FWIW