If Lightroom imports fine from all other cameras or SD cards and troubles only with this card, the problem is more related to the card itself.
You could try formatting the card after backing up all images and see it that helps.
I've actually tried that already. In fact, I tried formatting the card with the formatting tool provided by the SD Card Association, which didn't improve things.
I will try a different card in this camera tonight and report back.
Tried a different SD card that had never been in the A6500 tonight, and it has the same issue.
It doesn't appear to be an SD card issue.
Are you connecting the camera directly to the computer? If you are I suggest you stop doing that and buy a card reader or use the SD card slot on your Mac, if it has one, to get the images off the card.
It seems LR is displaying the images in the import dialog but thinks they are already in the LR database file, the catalog file,as that is why they appear grayed out.
I am removing the SD card from the camera and putting it into the one built into my MacBook Pro.
The images import fine if they're copied from the SD card to my hard drive before I try to import.
Ich habe das gleiche Problem seit Update auf 2015.10.1 unter Windows 10 mit Daten auf SD Karten. Die Karten werden nach jedem Import in der Kamera formatiert. Direkter Import von der Kamera (Leica M, X Vario und SL) findet nicht statt. Die Dateien lassen sich in Windows problemlos verschieben oder kopieren. Nachdem sie in das Verzeichnis verschoben wurden, kann dieses synchronisiert werden - natürlich auf Dauer kein geeigneter Weg.