White Vertical Artifacts on Emissive Materials in Packaged Build (Lumen Disabled)

Hi everyone,

I am encountering a rendering issue in Unreal Engine 5.5.

Our models using Emissive Materials are displaying strange white vertical column-like artifacts (light strips) when running the packaged build.

Key details:

  • This issue only occurs on specific computers; others render it correctly.

  • Lumen is disabled in the project settings.

  • Please see the attached screenshots for reference.

Has anyone encountered this before? Is this related to a specific RHI (DX12/Vulkan) or a driver issue?

Any advice would be appreciated!