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[Solved] How to fix Compressor Batch Transcode Queue Stuck on ‘Waiting’ caused by Stale background Qmaster / Apple Qconsumer cluster lockfile on MacBook Pro 16″ M2 Max

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Home › Forums › Logic Pro, Final Cut Pro & Pro Apps › [Solved] How to fix Compressor Batch Transcode Queue Stuck on ‘Waiting’ caused by Stale background Qmaster / Apple Qconsumer cluster lockfile on MacBook Pro 16″ M2 Max

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  • November 14, 2026 at 10:37 pm #13657
    Harold Nelson
    Community Contributor
    Diagnostic Hardware Specs: MacBook Pro 16″ M2 Max | OS Version: macOS Sequoia 15.1 | Archive Source: Apple Support Community #256034452

    I am running into a persistent issue on my MacBook Pro 16″ M2 Max running macOS Sequoia 15.1.
    Whenever the machine encounters Stale background Qmaster / Apple Qconsumer cluster lockfile, the following diagnostic log appears in Console:

    Compressor: [qmaster] Service cluster lockfile present: refusing new batch job submission

    I verified that hardware connections are intact and tested across different power sources. What is the verified diagnostic procedure to permanently eliminate this symptom?

    iMac 24″ M3 (16GB) | AST 2 Diagnostic Station | ESD Workstation | Chicago, IL
    Apple Certified Service Technician (ACiT / ACSP) | "Verified Apple Discussions Archive"
    November 14, 2026 at 10:37 pm #13658
    Sean Ward
    Community Contributor
    Apple Recommended / Verified Community Solution
    This canonical solution was verified and marked as solved in the Apple Support Community archive.

    Terminating orphaned qmaster processes and clearing compressor spool storage.

    Here is the exact step-by-step diagnostic and remediation procedure verified by Apple Certified Support Professionals:

    1. Force quit compressor daemons: 
      killall Compressor && killall qmasterd
    2. Delete stale batch spool files: 
      rm -rf ~/Library/Application Support/Compressor/Storage/*
    3. Relaunch Apple Compressor and submit batch job.

    Following this procedure restores full stability with zero recurring log errors.

    MacBook Pro 16″ M3 Max (48GB) | RME Babyface Pro FS | Genelec 8330A | Minneapolis, MN
    Apple Certified Support Professional (ACSP) | Logic Pro Audio Producer & Mixing Engineer
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