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AADerek
New Participant
April 24, 2026
Solved

Latest Q3 Headset Software Update Crashing Unity Play Mode w/ Meta Link Active

  • April 24, 2026
  • 6 replies
  • 793 views

Hello, a few of our developers have encountered an issue where after receiving the latest Q3 headset software update we now receive immediate Unity crashes when entering play mode with link enabled. Has anyone else encountered this?

Started with headset update to software: v2.3.1034 - Build 5208318.3200.520

We are on Unity 6000.2.9f1. Meta XR SDK 78.0.0

    Best answer by AAPete

    Yep. We reached out to Meta through another channel, and they said:

    This is a known regression in the v85 PC Link runtime affecting hand/body tracking initialization during Play Mode. We're actively investigating. In the meantime, you can work around it by renaming XR_EXT_hand_tracking.dll and XR_FB_body_tracking.dll to .bak in %OculusBase%Support\oculus-runtime\client-plugins\x64. This disables hand/body tracking over Link but restores editor stability.

    Which worked for us.

    6 replies

    Tobeuh
    Participant
    April 25, 2026

    also experiencing this. Makes development impossible.

    Tobeuh
    Participant
    April 25, 2026

    The problem is with the OVRBody body tracking. Remove all OVRBody refs from the scene and crashing stops.

    AAPete
    AAPeteAnswer
    New Participant
    April 27, 2026

    Yep. We reached out to Meta through another channel, and they said:

    This is a known regression in the v85 PC Link runtime affecting hand/body tracking initialization during Play Mode. We're actively investigating. In the meantime, you can work around it by renaming XR_EXT_hand_tracking.dll and XR_FB_body_tracking.dll to .bak in %OculusBase%Support\oculus-runtime\client-plugins\x64. This disables hand/body tracking over Link but restores editor stability.

    Which worked for us.

      VegaBiggsReal
      New Participant
      May 7, 2026

      Same issue here. I'm working in VR, Unity 6.2 and 6.4.

      I’m still investigating the issue. Unity freezes when entering Play mode in VR, and at the exact moment of the freeze all objects turn cyan/blue, which indicates shaders are compiling/loading. The shaders stay blue indefinitely.

      Important details:

      • Meta XR Simulator works correctly.
      • Other Unity projects work correctly.
      • Re-cloning the project does not fix the issue.
      • The issue also happens in a completely empty scene with only:
        • Meta XR Player
        • one Cube
        • default URP/Lit material

      So it does not seem tied to a specific scene or custom shader.

      Things already tested:

      • Deleted Library, ShaderCache, Bee, Temp, and obj
      • Disabled Asynchronous Shader Compilation
      • Tested minimal scenes
      • Created a new URP Pipeline Asset
      • Disabled several URP features (HDR, SSAO, Decals, etc.)
      • Checked XR/OpenXR settings
      • Tried changing stereo rendering modes
      • Investigated shader variant compilation possibilities
      • Changed the dll names
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