To be able to get help, you need to give us some rather important additional information:
- Your OS and version
- Your Lightroom version
- The type (jpg, raw) of the photos that do not work and it's source (camera type)
OS X Yosemite version 10.10.4
Lightroom CC (2015)
most file types... but in my current situation .NEF files
Camera Nikon D800E
Date/Time: 2015-07-06 10:04:23 +0200
OS Version: 10.10.4 (Build 14E36b)
Report Version: 21
Path: /Applications/Adobe Lightroom/Adobe Lightroom.app/Contents/MacOS/Adobe Lightroom
Version: Adobe Lightroom  (6.1)
Parent: launchd 
Duration: 2.30s (process was unresponsive for 49 seconds before sampling)
Steps: 24 (100ms sampling interval)
Hardware model: iMac14,2
Active cpus: 8
Fan speed: 1197 rpm
rest not added....
Theses are all jpg's. Are they from your D800E?
Can you open theses jpg's in any other program?
What did you use to transfer the photos to your Mac?
My problem is solved by by Kiwi Mike
cmd-i on picture folders showed that permissions where set to read only!
Thank you anyway for your time :-)
Anytime. .. glad it works.
Hi. I can't load pics to LR.
It is LR CC 2015.5.1.
Computer is iMac with El Capitan 10.11.4.
External Disk is My Book Thunderbolt Duo.
Pics are Sony .ARW raw.
I click Add (or Copy) and nothing happens.