Error Code after Update to Virtuemart 2.6.8.

I created a new coupon with no start date, and with an end-date in a few days, but when a customer tried to use it they got the "No record, unpublished or expired" error.
I tried putting in a start date, and now the discount actually does apply, but it still comes up with the error message.
What's going on?
Zoray

Found solution in another thread, in case anyone else runs across the same issue. "Enable store coupons" in AwoCoupon configuration did the trick. I don't know why it suddenly stopped working, as coupons worked fine until just yesterday, but perhaps it has something to do with the virtuemart update.