It may help you to uncheck all subscribed posts and save your settings, then clear all cookies and cache/temporary internet files, close your browser then re-open it. Subscribe back to the posts you would like and then see if you get any notifications. As Nadia has said, periodically check your spam/junk folders to see if any are ending up in there.
If the above doesn't work, then we will have to wait for Andy to go through the error logs, and as Laura has mentioned it won't be high priority just now