Hello ,
Thank you for posting in the community and sorry to hear about this issue. It can happen sometime if there is a hardware issue or in certain cases with Path Tracer.
Here is an article that might help resolve the problem:
https://twinmotionhelp.epicgames.com/s/article/Resolving-Black-Screen-from-Path-Tracer-exports
Please check the system requirements for Twinmotion:
https://twinmotionhelp.epicgames.com/s/article/Twinmotion-System-Requirements
If you are still experiencing a problem please contact us directly by reporting a bug using this link:
https://twinmotionhelp.epicgames.com/s/case-community-page
Kind regards,
Vincent B.