I used sprite shader to have shadows on 2d sprites in 3d scene, it worked for long time. But suddenly today I got strange black shadows, and now sprites are fully black (I delete direction light and create again, but it doesnt help).
I found similar problem:
[Sprite is completely black after apply shader - Ask - GameDev.tv](https://The same bug)
Unlit material works, but there are no light effect, I don’t know how to resolve that even for time, and avoid this bug.
I use Unity 6 6000.0.23f1 LTS.