I had a pretty bad day on 03/5/05 also, and i can say exactly what the problem is...
The time it takes a click on a link to pass through tradedoubler onto Jamster is around 4 to 15 seconds, when the clicks are going slow you can guarantee a bad day, nobody likes to wait around and most will think the link is dead.
If they could somehow speed up the process i recon sales would double.
You will see on
TD stats that you have had loads of click throughs and very low sales... this is because the person has clicked, the click has been recorded but the page has not had chance to load before the customer clicks off.
Sometimes the page doesnt load at all until you refresh.
Im no expert on things like this, but i do know i would personaly get fed up with waiting for such lengths of time.