Coupon Codes not showing on Sales Report

We use several coupon codes on our CS Cart installation and I'd like to see which ones are being used. If I click on Orders > Sales Reports, then Coupon Codes and search for codes used in 2011, nothing appears. But if I view individual orders I can see that the codes are being used. Can someone tell me why the codes are not displaying on the sales report?

I'd report it as a bug in bug tracker.