First ... go to the Tools ... Server Info ...
Copy everything from just below the menubar up to and including the php version so we can see for sure ...
Next, go to your Gift Certificate/Coupons ... Discount Coupons ...
What are the precise settings on your Discount Coupon?
Then, look at the restrictions ...
What are the settings there?
You have allow and deny settings on category and/or product ... can you be more specific?





