I get a repeatable crash upon selecting Preferences in the menu for Lightroom CC.
Deleting preferences in ~/Library/Preferences does not resolve the matter.
Having the same issue, crazy that Adobe would release a product in this condition.
Can I get you to report it at the bug report forum please, as I can't reproduce it. https://feedback.photoshop.com/photoshop_family/categories/photoshop_family_lightroom_cc
The only solution I could find was uninstalling and reinstalling.