I have been using Lightroom CC test version on a Macbook with OSX 10.10.5. After exporting my pictures from OSX-PhotosApp, Lightroom could not import all photos. There was no error message, no freeze, but Lightroom would simply never finish the import. It randomly stops importing after a couple and up to about 360 photos. Same behaviour when importing photos from my camera. I tried out many variations of importing during days, checked forums and common problems, but could not fix the problem. Lightroom would still start import but not complete it. Sadly, I have deinstalled Lightroom now, because a main feature does not work reliably. If somebody would care to help me with my problem and fix it, I would be happy to buy Lightroom.