I think this thread is missing some vital information:
- Which exact version of Corona is used?
- Which Max version?
- Which Windows version? (it looks like Win 7)
- Are there some 3rd party plugins used? (iToo, Laubwerk, Siger, ......)
- Did you send your scene to us? Which upload method did you use, and what's the file name?
- Are any assets stored on the network? If so, does the issue persist if they are stored locally?
Some things that come to my mind based on the information we have right now:
1) It could be somehow related to textures - have you tried converting ALL textures in your scene to 3ds Max Bitmap or to Corona Bitmap? You can do this with the converter script (right click in any viewport > corona converter > then there are two options "Bitmap to CBitmap" and "CBitmap to Bitmap").
2) Proxies - what are your proxy settings? Are you using the "Store in RAM" option? Have you tried toggling it on/off?
3) Are you using the UHD Cache? (performance tab) If so, have you tried switching to path tracing only? (path tracing as both primary and secondary GI solver)
4) It could be some 3rd party app - 3ds Max, some other plugin, or antivirus/firewall doing some stuff in the background. This would be hard to diagnose.
To understand a problem and provide reliable solutions, we need to have as much information as possible, and it is best if we have the scene itself to reproduce that problem. Without it, it is really hard to help, and we can mostly blindly troubleshoot.
Also, did you start a support ticket? (by sending an email to support@corona-renderer.com or using this form
https://coronarenderer.freshdesk.com/support/tickets/new)
I am asking, because I could not find it.