I am having the same problem since yesterday at 2:00. I have gone into the home page of Q&A and chosen to receive alerts from all locations. Then I have gone into my personal profile and saved every area of interest. I even changed to my different email address on my profile just to see if it made any difference.
I also attended Trulia's webinar this morning, and followed the same thing that I've already done...but nothing. HELP!!!!!!!!!!!