Hello,
Not sure if that is something i never noticed, or some weird bug. If creating a corona-physical material. The Material preview is not showing the base/Diffuse layer if texture map channel is other than 1 if i use a composit map to mix various texturemaps.
All other maps like glossy or bump show correctly.
I probably didnt noticed, when i used straight the map or with legacy materials.
I’m using Max 2020 and corona 7 hotfix1
Hi,
I was unable to reproduce this issue on Corona 8 hf 2.For me, it is working fine. Please see the screenshot here: Screenshot by Lightshot
It is possible that you are doing things differently than I have done. If you can provide me a simple scene or some repro steps so I will be able to reproduce this on my end.
Also, please try using Corona 8 hf 2 and see if the problem you are referring still persists.
Let me know.
Hello, it is Nazar here from Corona support team - do you have any update on this issue?
sorry… I was busy with work and didn’t looked into the forum for a while.
I think i need to find some time to test with newer corona version - maybe after eastern.
I tried it with Max2020 and recent Corona 9 hotfix 1 … seems to work as supposed.
Not sure if it was something in Corona 7 which i used before or complex scenes - but haven’t tried that again - as the most recent version seems to work.
Hi,
Thank you for your update. We always recommend using the latest version of the software, as any issues present in previous versions may have already been fixed in the most recent release.
Happy Rendering and stay bug-free 
