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Reply To: [Solved] How to fix Final Cut Pro ProRes 422 HQ Export Hanging at 68% caused by External APFS NVMe disk write throttle and corrupted optical flow motion vector cache on Mac Studio M2 Ultra
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Home › Forums › Logic Pro, Final Cut Pro & Pro Apps › [Solved] How to fix Final Cut Pro ProRes 422 HQ Export Hanging at 68% caused by External APFS NVMe disk write throttle and corrupted optical flow motion vector cache on Mac Studio M2 Ultra › Reply To: [Solved] How to fix Final Cut Pro ProRes 422 HQ Export Hanging at 68% caused by External APFS NVMe disk write throttle and corrupted optical flow motion vector cache on Mac Studio M2 Ultra
Alex TannerPurging 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:
- In Final Cut Pro, select your Project in the browser, go to File > Delete Generated Project Files, and select Delete Render Files (All).
- Select any re-timed/speed-ramped clips, open the Video Inspector, and change Video Quality from Optical Flow to Frame Blending.
- 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.