Hi,
Bit of a long shot but...I had discount coupons 2.1 working fine on one site (updated with RC2.1 and most of RC2). I've copied the site and installed Paypal IPN v1.4. All seems to work fine on the order front and applying the discount to the order totals. However, if the min order for the coupon is say £10 and the order is below that instead of the usual error message across the top it goes back to the cart. It then will only proceed once you've added enough products to ge tot the min order. trouble is there are no messages or anything so the user has no idea whats going on. I disabled paypal ipn and it still doesn't work using cheque as the payment option.
Anyone got any ideas? Thanks :)