I am having an issue with El Capitan and iMovie (10.1). I have tried everything!! I now have isolated this problem to my MacBook Pro Retina display late 2014. I can get the iMovie to work on an older iMac (prob 4 yrs old) that is running el Capitan as well (until it stops?). I CAN NOT believe that Apple is not working on this issue. I just had an update for el Capitan and NOTHING was addressed with iMovie .
I have uninstalled and reinstalled. There are no preferences in el Capitan and nothing to do in disk utilities
I would appreciate any help from APPLE! In all my years with Apple (1984) I have never been without an application like I have experienced presently I can edit all day, save in the Theater and it shows in Projects, but I CAN NOT export these files in any way!! HELP