I am using Lightroom on my MAC where I import the finalized JPEG-pictures into iPhoto to create a slideshow (for instance in combination with films). When exporting the slideshow with a 1080p resolution to iTunes I experience difficulties (missing slides and black transitions). When using JPEG-pictures directly from the camera there are no problems, so the manipulation in Lightroom seem to cause corrupt files. Does anyone recognize tje problem and could it have anything to do with the introduction of the Yosemite software? Is Lightroom already Yosemite-proof?