Unfortunately I have some massive problems with Lightrrom Classic CC (newest version - I just updated) on my MacBook Pro from 2016 (15", Touchbar, macOS 10.13.3).
Lightroom crashes all the time. I'm not able to import any pictures (I tried it from SD card, from my hard drive with different import options) - after a few seconds Lightroom or even my Mac just crashes. When I try to edit any photos it's the same.
I also tried to reset the Lightroom settings and reinstalled Lightroom - without success.