I am having an incredibly frustrating time importing on a MacBook Pro running OS X 10.11 (El Capitan). I haven't used Lightroom for a month or so and in the meantime there's been an updated that completely changed the import dialog (according to the CC I'm running the most up-to-date version - it's listed as 2015.2.1). I have photos shot on a Nikon D810 in raw format. I open up LR, and hit "Import" and select my SD card in the dialog. It loads my photos (~1900 of them), and hit "select all" to deselect them. All of the previews show up fine and I can look at individual images. I then choose a single photo (or group of photos - same behavior) and select those. I think the "Import 1 Photo" button, and it gives me the following dialog.
I've tried it many times, with different SD cards. Any thoughts?
Please Check the Read & Write Permission on Source location from where you importing the Images.
try importing the images from the desktop location, please check if you have selected the correct destination for the Images also check the Read and Write permission to that location.
Go to Preferences
Click on the General Tab
Uncheck the Option "Show Add photos Screen"
Restart Lightroom and try importing the images.
Let us know if that helps.