Any reason to why the ID masks sometimes render with a ghosted beauty effect over the top? It makes a noisy mask with areas of the beauty ghosted on top making it not very good for selecting IDs.
Some views work fine, others not so good.
This is a known issues and we are working on a fix.
If you have a sample scene you could share with us, this could possibly speed up the fixing phase.
Could you try this, and let me know if it helps or not?
https://forum.corona-renderer.com/ Corona 1.7 - CMasking netrender error #msg114717
Pavel is currently debugging this