Setting up a new coupon for a baker's dozen promotion where they buy 12 get the 13th for free, I got it working except I can find the option "Allow Multiple Discounts" so it can be used for quantities greater than the first 13 purchased
Response:
The "Allow Multiple Discounts" option was replaced by a new coupon enhancement: http://www.nexternal.com/updates/#791
To get a similar result to the Allow Multiple Discounts, you will set the Discount Application (Top Right of the Edit Coupon Page) to All.