This happens to one of my sites about 3-4 times a day. I'm promoting a affiliate product and can see that people order through my site because I have my code the the product's thank you page and so my tracking software shows the order and the keyword search, etc.. However, I don't get credit for the sale (Clickbank product). I can only assume it's because they've been cookied somewhere else prior to ordering through my site. My traffic is 100% organic on this particular site. I'm probably losing $30-$50/day because of this. Anyone else dealing with this particular problem?