At the moment I’m not able to see the same thing on my end. I’ve copied a project to a computer that doesn’t have UE4 installed and back without any issue.
Is this only with your project or any project that you create? If it’s happening with any project, can you make a simple blank project with no starter content and upload here. I’ll try to build lighting and see if I’m seeing the same issue, although I doubt I will see anything it’s worth a check to see.
Some additional things to try that may or may not help:
- Delete/backup in another folder location your Intermediate and saved folder from your project folders location.
- Re-install UE4 and/or use the Verify option in the dropdown for the engine already installed from your library tab in the launcher.
Let me know.