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AA_Derek's avatar
AA_Derek
Honored Guest
24 days ago
Solved

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

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

  • AA_Pete's avatar
    AA_Pete
    22 days ago

    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

    • RainerTee's avatar
      RainerTee
      Honored Guest
      23 days ago

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

      • AA_Pete's avatar
        AA_Pete
        Honored Guest
        22 days ago

        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's avatar
    VegaBiggsReal
    Honored Guest
    11 days ago

    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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