There are breaking changes to the Atlas UI between 7 and 8 which could be what you are seeing here.
Have a look at the migration guide for tips on how to troubleshoot this.
Thanks for the suggestion. We do have some Atlas UI changes. Since I didn’t want to sort through what might be the cause, I decided to create a simple test. I tried to open the Test.mpr from radioButtonList (from Github). I converted it to 7.23.8 and then tried to open in 8.2.2 But I got an error (see below). Rather than debug that, I just created a new app in 8.2.2. It is a simple blank app. I copied the functionality from the DirectionVertical page, and Vertical Direction has no effect.