I'm going through BlenderGuru's tutorial and he's using Principled BSDF as a glass material and Cycles as the render engine. The cup by itself looks fine, so does the plate, but if you look through the cup at the plate, it's all weird and kinda dark. Same if you look through one cup at another cup.
I've set the Base colour of both the cup and plate's material to pure white (it's the same material anyway), same with Surface Colour. Roughness is set to 0, IOR is 1.5 and in Render Properties Light Paths>Max Bounces Total, Transparency and Transmissions are all set to 8 (I increased these to 12 to no avail). I also turned on Reflective Caustics and Refractive Caustics.
The last image is what BlenderGuru's realtime render looks like. No weird transparency issues there.
Anything else I can do?