This is about the 4th time this has happened to me, the previous 3 I contacted the affiliate contact who couldn't work out what was going on. Basically, in my account it shows a sale yet there's no commission. No one has yet given me an answer over and it's just happened again. What can cause this? Apart from a error on behalf of the affiliate program but is there anything else that can cause this? Certain cookie settings on a persons browser or something? Frustrated..