What you're describing is usually the result of faulty hardware. You could try doing a HWInfo log ( https://support.lumion.com/hc/en-us/articles/360021829573-How-do-you-provide-a-log-file-from-HWiNFO- ) then running something like OCCT 3D and see if it reproduces the issue. Once it does and you restart send the excel file it creates
Lumion - User Support
- Here's how
Technical support staff members may ask you to attach a HWiNFO log file to a Lumion Support Center topic from time to time when working to resolve a problem.
The HWiNFO log file is a ...