Since I installed the April update of Android 6.01 on my Galaxy S7 (non-american version with Exynos) some apps from UE show black material.
The Android update has the following version number: Android Version: 6.01 G935FXXU1APD1/G935FAUT1APD1/G935FXXU1APD1.
Previously following didnt have following material problem and now since the april update have them:
In this app all the cars are black now: https://forums.unrealengine.com/showthread.php?95624-Android-LastAction-Free-3D-shooting-and-racing-game-on-spline-track
Here the Floor is completly black: https://play.google.com/store/apps/details?id=com.spaceharry.takotakounlimited
Other apps have the same problem which where made with different engine version from 4.7 to 4.10.
Im 99% sure that the update in april caused the problem, because those apps were one of the first apps I tested after getting the phone back in march.