Hello! I've been using Shaders with 'Rift-1.0.4-66.jar' & i've noticed issues.

(Shaderpack: Sildurs Vibrant Shaders v1.171 High - 1.13)

As soon as i install Rift the Glass turns into a Orange block & most of the shader stuff stops working like the water. (Screenshots below)

Top Picture = With Rift
Middle Picture = Without Rift
Second to Bottom Picture = With Rift, showing the water.
Bottom Picture = Without Rift, showing the water.

Without Rift there's no issues.

I hope this can be fixed, thanks :)

• G

Had the same problems, it's an optifine issue.