I have years of using a mac and in all this time I never have issues with Mac OS X until I update to 10.10.3. The worst thing of this update is PHOTOS, how could Apple authorize release the worst app ever they have built. Right now I can't import my iphone photos in that horrible program, before with iphoto I never have a single issue and now I can't import my photos. Also it is slower than iphoto and you don't have great features like dividing your photos with events. Please Apple let us install iphoto and keep updating iphoto with new versions, that is the only way I will let you keep photos because it is the worst ever software I have seen from Apple.