Zen Garden loads, then the screen fades in and out as if it's ready to begin play. But when the player taps the screen, the only thing that moves are some lensflares, and the level never transitions into a playable state.
This issue doesn't occur on the same devices in 4.16.
So far this has occurred on all iOS devices tested:
iPad Mini4, iOS 9.3.5
iPhone 6s 10.3.2
Does NOT repro when cooked and deployed to Android ES31 (Galaxy S7 Adreno)
Does not repro on PC.
Setup: Download a 4.17 build and Zen Garden from the Launcher
1. File > Package > iOS
2. Install to device and run the App
RESULT: Game remains on the opening screen; tapping also doesn't start gameplay
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-47396 in the post.