This works a little different than the old board. When you check the 'favorite' box this means it will send you email from that thread when anyone posts to it and not just responds to you. It gives you a lot more email that way and not neccesarily email that is just for you.
Mine stopped a few days ago as well. I thought it was my account automatically blocking it since I had a problem with getting a password from my google mail account sent there as well.
