On a mac with the newest lightroom update and mac software as soon as I go to the import dialogue I get the spinning beach ball of death
Please try the following steps.
Go to Preferences
Click on the General Tab
Uncheck the Option " Show Add Photos Screen"
then, Go to Performance Tab
Uncheck the GPU
Restart the Lightroom
If the above steps didn't work for, please try create new catalog and disconnect all the external resources.
Let us know if it helps.
If the above two steps don't work. Consider rolling back to the previous lightroom until the stability issues get fixed: http://www.lightroomqueen.com/how-do-i-roll-back-to-lightroom-2015-1-1-or-lightroom-6-1-1/
that looks like it worked. thank you