I had posted a message ot another forum, clicked on Notify me for replies, but never got any emails about the replies.
I also got a PM, and never was notified.
Is there some global notification setting that needs to be enabled somewhere????
There is a 'Notify by email' [yes/no, default no] setting on the last page of your board profile.
I'm not sure if it relates to notifications, but its worth changing it to yes to find out.