Did you check the affiliate area? There is a link to payments in the stats area. And from there you can see when your payments are processed. And like many other programs they do a 30 day hold back.
I deposited a big check from I$ on Dec. 8th and the next one will be in the next few days. Maybe a day or two delayed because of Christmas just like all the other checks from affiliate programs are.
Check that link in the stats area and make sure. If you're a new affiliate then you have to make sure that you reached a payout limit and that 30 days have passed since your first payout was processed.
Mine always shows the 1st and the 16th as payout processing days for each period.