I use Lightroom CC 2015.12 on Mac OSX 10.12.5.
Since a few weeks now, whenever I tell Lightroom to import a directory of images & videos, it starts loading the preview thumbnails and as soon as it hits a Video file, it just sits there and does not continue.
Canceling the import and trying again does not help, the 2nd time it does not even start showing any image thumbnails.
Also, once I stop the import after it hung itself up, I can not quit Lightroom either, it will not shutdown. I need to FORCE QUIT to get out.
Only way to solve it is to move the video files out of the folder and import only images!
Any idea what to do?!
Short answer is move video files to a separate folder before you import still images. LR has problems, in more ways than one, with video files.
I was fearing that might be the answer