In Nov last year it was mentioned on the blog that there was a new Whataburger going up in front of the Lowe's store at Back Beach Rd (ok its also known as Panama City Beach Pky) and Alf Coleman Road.
Well, it opened last week and it is a 24 hour restaurant, located next to the Hardee's restaurant and near the Publix grocery store. From customer comments on a web site it seems that they need to work on their customer service and food preperation issues, probably this will eventually be sorted out, but for the moment they are not well rated by customers.
http://www.whataburger.com/contact_us.php