Black Texture Glitch After Latest Unity Update?

I just upgraded to Unity version 5.6.0f3 and now I have these weird black texture glitches on my characters and the ground of my map when I build my app to my Samsung Galaxy S7. Does anyone know what is going on?

Screenshots below:

There was an issue with importing textures (in 5.5) that caused certain textures to lose their transparency, and show a black background instead.

This bug was fixed as part of 5.5.3p1 patch release ( see here: Download Archive )

Perhaps you have the same issue, in that case, you should expect a patch version for 5.6 to land some time soon to fix that.