I tried everything here and then called Apple support.<br><br><br><br>They could not figure it out either but then in trying to capture data on my computer we went into Safe Boot mode and booting up in that took forever but after it was completed and booted back into regular mode iMovie worked.<br><br><br><br>Think that there was a disk issue that booting into Safe Boot mode fixed.<br><br><br><br>To do this, shut down. Start computer holding down shift key until you see progress bar. In my case this startup process took 5 minutes on a new less than year old MBP.<br><br><br><br>Then shutdown, started regular and iMovie worked again.
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