I have Photoshop CC with Lightroom. Mac OS X (10.10.2). I have been importing a lot of images, but now Lightroom won't open. The Logo box appears and the beach ball turns and turns. No dialog box. I was going to uninstall/reinstall and found the directions for doing so. I can't find the Preferences because I have no Library in user/username/Library/preferences. Any suggestions as to how I should proceed now? Thanks.