Thanks for the reply! I had several follow-up emails from customer service that were helpful, but the problem is still not resolved. I do not use any other survey sites, and I clear my cookies using a program that clears cookies from *all* browsers before I do surveys on QR. I had another survey from the same day that credited. I had a survey yesterday that credited. For now I will try using one browser *only* for QR. I have been using the site since April 2011 and while I have had the occasional survey not credit, I have never had four of them in one day like they did the other day. Thanks for your help!