Two projects with same (Cardboard) prefab, but one works and the other doesn't

So I had a simple Cardboard Sample app that splits the screen i half and displays the image in both halves, allowing you to use it with Google cardboard for VR. Tried it. Works with no problem.

So I took one of my existing projects, copied as a new project, then converted it to an Android app. I added the Cardboard prefab and in the editor it works, but on the device it does not. So to test it I imported the demo scene that had worked in the other project. Same result. This scene that I KNOW works in one project, does not give me the dual display in the other project.

I've opened both projects at the same time and ensured all the Player Settings under Build Settings are the same, and that all the prefabs were the same, with the same configurations (it's the same scene in two different projects).

So, any guesses as to why the original does render two images in the Editor and in the Player, and the other works in the Editor but NOT in the Player?

I've intentionally not included code because the code is identical and unchanged between the working and non-working projects, and I don't want to muddy the water with a lot of speculation on the code. This has got to be a settings issue, but one I'm not finding. And yes, both are the same version of Unity (5.3.1f1 personal).