Q: iMovie black frame with macbook pro and iPhone 6S+

I have exactly the same problem. I've clean installed ElCapitan to see if the problem disappears but no luck. Photos in the iMovie Library pane turns black or green when mouse is over them. Right after photos are imported into the project sometimes they are ok but couple seconds later they turn to black when mouse is over them, except the first photo. It turns black later though. I went back to Yosemite and iMovie 10.0.5 and no more issues. I think ElCapitan and iMovie 10.1 are the problem maker. My system is iMac late 2007, Canon EOS 40D and iPhone 6 Plus.

Massimo hai risolto? Have you solved your problem? same situation for me...

Hi Massimo, I have been having the same issue but just opened my photo with preview, entered full screen mode and took a screen shot and this will now load in iMovie! Hope it works for you!

i had issues with black and green frames that were resolved with the 10.1.1 update. an official support article was also released with 10.1.1 addressing the issues with still images... If still images are solid green or black in the iMovie Viewer - Apple Support