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[Solved] Mac Studio M1 Ultra Compressor Batch Transcode Queue Stuck on ‘Waiting’ (macOS Sonoma 14.6) – Verified Troubleshooting

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Home › Forums › Logic Pro, Final Cut Pro & Pro Apps › [Solved] Mac Studio M1 Ultra Compressor Batch Transcode Queue Stuck on ‘Waiting’ (macOS Sonoma 14.6) – Verified Troubleshooting

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  • November 14, 2026 at 8:27 pm #11726
    Karen Brooks
    Community Contributor
    Diagnostic Hardware Specs: Mac Studio M1 Ultra | OS Version: macOS Sonoma 14.6 | Archive Source: Apple Support Community #256278738

    I am running into a persistent issue on my Mac Studio M1 Ultra running macOS Sonoma 14.6.
    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?

    Mac Studio M1 Max (32GB) | Dual Dell UltraSharp 4K | Logitech MX Master 3S | Tokyo, JP
    Product Designer & Design Systems Lead | "Verified Apple Discussions Archive"
    November 14, 2026 at 8:27 pm #11727
    Kenneth Turner
    Apple Master (Lvl 10)
    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 Air 15″ M3 (24GB) | CalDigit TS4 Dock | Kensington Orbit | Denver, CO
    Apple Certified Support Professional (ACSP) | Enterprise Mac Sysadmin & Jamf Pro Architect
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