SteveWh - 11:19 am on Apr 13, 2011 (gmt 0)
If traffic is the same but sales are down, could it be that your traffic now consists of different people (from a different source) who are not as inclined to buy as your previous visitors?
Traffic has dropped from the countries where you sell well, and is now coming from other countries? Overall traffic numbers are the same, but it's not the same people. That could happen if your search engine rankings have fallen for searches originating in the U.S. but are now higher for searches originating from Asia or South America.