With LR 2015.8 and v6.8 I can not Import anything at all, the Import button is greyed-out.
Current advice is to go back to 2015.7 but every link I've tried gives me 2015.8, so where can I find a link to the previous version?
Go to the following website:
Install Photoshop Lightroom
Click on the expansion arrow for "Install Lightroom 6" then you will see all the updates listed.
Retrieving data ...