Does it make any difference if you toggle the destination panel on the right-hand side of the import dialog? It seems rather quirky but some users claim that clicking to close and then opening the tab again restores normal import behaviour.
The other thing to check is permissions.
On the menu bar click Go whilst holding down Opn(Alt) key and choose Library. Note that the user library is hidden until you press Alt.
Navigate to Application Support and then Adobe and highlight the Lightroom folder. Press Cmd+i and ensure everyone has read and write privileges. If not click the padlock icon and change.
Close the Lightroom info dialog and re-launch the application.
The full file path will be:
Macintosh HD > Users > [your user name] > Library > Application Support > Adobe > Lightroom
Thanks for your tips @99jon!
I tried the toggeling...no effect. And also cecked the permissions which have been set to read and write privileges already.
As a side note. The problem occurred when I was selecting images in the import dialoque from a 128GB card, which was close to full with images...
Any other suggestions on how to solve this problem?
The only other suggestion is to test if it's hardware related.
Is the camera being connected, if so try using a card reader.
If a card reader is being used try a different one or a USB3 or USB2 connection.
If you can get the images into a regular Finder folder try importing using "Add"
I was able to transfer the images from the card with the finder just as usual.
However, I tried to use the "Add" function now... What I noticed is that I am not able to choose a file (they are not "clickable" if you will).
I tried different folders with different file types and it's all the same for all of them...
Seems like that's some bigger issue...