iMovie keeps saying 'Turn on iCloud Drive' even though it is on
When I use iMovie lately, the 'iMovie Theater' keeps saying 'Turn on iCloud Drive' in the upper left had corner. However, i have iCloud drive for iMovie turned on. I try to turn it off and on several times in the iCloud settings. Is anyone else having this problem? Is there another setting that I don't know about? No movies show up in the 'IMovie Theater' even though I have around 6 or 7 on my other devices. (Although I usually have problems with the iMovie Theater not syncing correctly between all my devices.)
iMac with Retina 5K display, OS X Yosemite (10.10.2)