Membership Coupon Problem

When I try to add a coupon to Membership I go through the entire process, setting coupon code, value, date range, use number, etc. and hit add. After the page refreshes back to the coupon list there is a confirmation that the coupon was added, but it never appears in the coupon list (so I have no coupons).

I already tried repairing the membership tables in the Options->Advanced tab to no avail.

Any thoughts?