Seems like Apple has changed the permissions model, and Skybox doesn't ask to use the accelerometer / motion data if it loses permission (i'm speculating). What happens if you try to watch any 3D movie is the video spins really fast, almost like you were stuffed in a barrel and rolled down a hill. Because it's spinning so fast, there's no ability to hit any of the UI buttons or prompts. I haven't been able to find a setting within the app, nor a setting within the iPhone Settings that will let me re-request or re-grant permission for Skybox to use the accelerometer, so I think it's stuck.
Would be excellent if an option could be added to Skybox for it to re-request all the data permissions it needs, perhaps tucked away into settings that are in the 2D browsing UI (not the 3D playback UI).