Hi, I tested a little with Godot 2.1 and 3d scenes.
I made a simple project with a basic setup and a Sprite3D. While its working perfectly when testing on my pc or on one smartphone I have, it's not on my Galaxy s2.
I uploaded the test project to github:
Here is how it looks on my smartphone:
Hope theres someone here who can have a look, I tried various import options but nothing worked :/ It seems to have something to do with the size of the png, Because I tested some smaller ones that worked.