If you're having a (like black screens or export fails)
: Reviewers found the redesigned interface counter-intuitive compared to the "stacked timeline" and precision editing tools of iMovie 9. iMovie 10.1.9
: Users reported significant slowdowns in import times—sometimes jumping from minutes to over an hour—and frequent "Can't Encode" errors during export. If you're having a (like black screens or
: Built on the foundations of the 10.1 branch, this version continued to offer accessible 4K editing (3840x2160) for compatible Macs. iMovie 10.1.9
iMovie 10.1.9 slow import from sd card - Apple Support Community
: Resolved critical issues where HEVC video clips and HEIF photos would incorrectly appear black in the viewer. Bug Fixes :
The primary focus of this version was compatibility with the contemporary hardware and media of the time: