What is the version NUMBER of Lightroom? Do not tell me "current" or "up-to-date".
What is the version NUMBER of your operating system?
Did the EHD become disconnected physically at any time? Did you plug in other USB drives while this was going on?
I am using Lightroom CC 2015, I am using a MAC, My operating system is OS X El Capitan. As far as I know, the EHD did not disconnect at the time of uploading. However, I I have disconnected, turned off, turn on, unplugged, replugged the EHD while trying to trouble shoot.
You have me thinking. While the photos were being downloaded, I did push one of the pictures to Photoshop, did some work on it and pushed it back, thats when I started having issues. I'm wondering if the flow was interrupted because I pushed it during the upload process.
Status: Reloaded Operating system & LR/PS, and still had issues. So, reformatted Hard drive, reloaded all software, now its fixed!
I have the same issue for few days now.
Out of blue all my HD disappeared from "Folders" but when I am trying to re-import some photos it's recognised.
Even if I finally import again some of the content HD is still not visible in "Folders" so If I click to my internal HD I can't go back to the external one. I'm going mad!