I installed Vray5.1update1, clicked -preset - to load any system or my rendering Preset, it no longer crashed; At this time, this computer only has one renderer Vray, and then I install Corona2021-04-21. At this time, the computer has two renderers CR&VR. I switch to Vray, click -preset - to load any system or my rendering Preset, at this time, Max will directly error, prompt error and need to exit and save.