Hi, I'm using Lightroom 5.7.1 on a new iMac on OS X El Capitan. I've been importing from my Nikon for years, but now it will stall once I have selected the images and hit "Import." The Import task bar just doesn't progress and no images are imported. I looked in the Pictures folder that I'm trying to import into and I have Read & Write access. I'm not able to highlight "apply to enclosed items," so I'm not sure if that has anything to do with it. Would greatly appreciate help in getting this back up and running for me. Thank you!
Sounds like your Mac is losing the connection to your camera.
Either buy a card reader or use Finder to Copy the images from the camera to a folder of your choosing on your drive. Then import them into LR using the Add option.
Apple has changed the USB stack in El Capitan which is probably the cause of the problem. I doubt a card reader would be any different. Connect your camera and launch Image Capture, to get the photo files on to your Mac.