If you are using the latest WordPress version (which you should!!!), you’ll notice that eShop plugin will be perpetually set to Test Mode and there’s no way to turn it off. There’s quite a number of suggestions in the official forum at quirm.net but as it turns out, the option is inadvertently hidden. All you have to do is to activate the two column mode of the dashboard and you’ll be able to see the dropdown option.
For those looking for it, I know how you feel. I just felt too stupid to not thinking about it. Admittedly, it’s probably one of the many plugins affected by the latest WordPress enhancements. I bet once rich updated the plugin to conform with the new standard, then it won’t be a problem anymore.