I have also discovered that anytime I’m Xref’ing a file into my current scene it seems to become corrupt and fails to load once I close Max and reopen the file.
If possible, please send us any problematic scene like this. It would be best to use the “archive” option to include all assets and xrefs. You can then upload them using Chaos
The scene will be only used by our team for debugging.
The most convenient way to include all of those information would be to gather them and contact us via our support portal: https://coronarenderer.freshdesk.com/support/tickets/new
I am not sure if you speak Polish, but even if you do, it would be best if you use English in your support message, so that it will be possible for me to share the case with other team members.