Membership Coupon Codes have stopped working

IMMEDIATE HELP PLEASE!

The coupon codes were functioning properly and now they're not working at all.

The problem for me is my entire marketing campaign is centered around the Coupon Codes so when they stop working, I'm basically out of business.

Obviously, I need to rethink this strategy, but in the meantime I need to get the coupon codes working again as soon as possible!

DETAILS

Right now, when a person pushes the "Apply Coupon" button, instead of having the discount applied, the system goes to a blank "Create an Account" page.

This is happening with any subscription, any coupon code, and in any browser we've tested.

As an FYI, this problem is NOT happening if you try to use a coupon code and you're already logged in.

Please mark this as a super high priority!

Thank you. Dori