Material Library menu has disappeared. After adding the menu back manually (Customize > Customize User Interface > Menus > …) and saving default scene OR save Custom UI scheme OR save default state, the menu will not re-appear.
3ds Max booting up… (Corona Menu is visible)
3ds Max ready (Corona menu disappears)
This issue is at least specific to RC1; the issue does not appear in Corona version: 6 (DailyBuild Jun 18 2020)
Hi,
The Corona top bar menu was deprecated and removed in RC1: https://forum.corona-renderer.com/ Corona Renderer 6 for 3ds Max - Daily Builds Changelog #msg173811
You can launch the matlib from the Corona toolbar and even assign the toolbar actions to custom keys now.
Thanks,
Rowan
I thought I might have read that and just forgot. Thank you for the gentle reminder 
That being the case, why is it that the Corona menu cannot be created manually in the manner I have described - is that a Max issue?
Hi,
We’ll look into that one as I’m not sure that was intended.
In the mean time you can just give the toolbar a different name “Corona v1” for example and it won’t be removed.
Cheers,
Rowan