Some UI elements (especially the back of sliders or buttons) appear black (or very dark) on Android, but work fine on iOS and the Editor.
What can cause this?
Maybe a shader not compatible with mobile or a 4096x4096 atlas or textures not supported on mobile?
They are default assets:
Bump!
We’ve actually had the same issue today. We rebuild the APK and it started working, I really would like to know why 
?!?