OK, you know you've checked your settings in your User CP and you know your subscribed threads are set so you're supposed to receive an email when a new one comes in? This is tricky, so double-check it. You need to both have some subscribred threads listed and then on that pull-down list in the lower-right green bar you need to make sure you've selected the email option. There also needs to have been some recent action on the thread itself because you're not going to get an email if no additions have been made to the thread.

If you've made sure everything's set right, try signing out, then emptying your temporary files folder in your browser, then restarting and see if that helps. If that doesn't seem to cure the problem, let us know and perhaps Sundance will have an answer. Good luck!