Again, not sure how this works, but as it can sometimes take a while for an item in the forum to be answered, is it possible for a "please check forum" message to be displayed once an answer is received?
Just in case anyone else thinks the same, I've now received a reply to another question, and received a message on my 'changes' page, so what I've said above already happens.
in that several of us did not receive notifications when comments were added to topics we'd either started or responded to. It was raised as a problem.
I've not had any such issues recently, although I haven't been adding many comments, so it may well have been fixed.