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[Solved] Final Cut Pro ProRes 422 HQ Export Hanging at 68% on macOS Sequoia 15.1 + Final Cut Pro 11.0: Diagnostic steps and permanent fix

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Home › Forums › Logic Pro, Final Cut Pro & Pro Apps › [Solved] Final Cut Pro ProRes 422 HQ Export Hanging at 68% on macOS Sequoia 15.1 + Final Cut Pro 11.0: Diagnostic steps and permanent fix

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  • November 14, 2026 at 8:23 pm #11678
    Karen Tucker
    Community Contributor
    Diagnostic Hardware Specs: Mac Studio M2 Ultra (128GB) | OS Version: macOS Sequoia 15.1 + Final Cut Pro 11.0 | Archive Source: Apple Support Community #256375534

    I am running into a persistent issue on my Mac Studio M2 Ultra (128GB) running macOS Sequoia 15.1 + Final Cut Pro 11.0.
    Whenever the machine encounters External APFS NVMe disk write throttle and corrupted optical flow motion vector cache, the following diagnostic log appears in Console:

    Final Cut Pro: [RenderEngine] OpticalFlow optical motion frame render timeout at frame 0xcea9

    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) | Kawai MP11SE Stage Piano | AirPods Max | Edinburgh, UK
    Classical Pianist & Spatial Audio Arranger | "Verified Apple Discussions Archive"
    November 14, 2026 at 8:23 pm #11679
    Oliver Krueger
    Lead Moderator
    Apple Recommended / Verified Community Solution
    This canonical solution was verified and marked as solved in the Apple Support Community archive.

    Purging generated project render files and disabling Optical Flow on speed-ramped clips.

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

    1. In Final Cut Pro, select your Project in the browser, go to File > Delete Generated Project Files, and select Delete Render Files (All).
    2. Select any re-timed/speed-ramped clips, open the Video Inspector, and change Video Quality from Optical Flow to Frame Blending.
    3. Export destination should be an internal APFS location first before transferring to external storage.

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

    Mac mini M2 (24GB) | Apple Technician Guide Hub | Fluke 87V DMM | Zurich, CH
    Apple Certified Support Professional (ACSP) | Apple Certified Service Technician (ACiT / ACSP)
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