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Try deleting the prefs.
Quit Lightroom, launch Finder and go to your user library
Macintosh HD >> Users >> [Your U/N] >> Library >> Preferences
The user Library is hidden in recent versions of OSX. To get to your user library quickly, from the top menu in Finder, click “Go” whilst holding down the Option (Alt) key and it will appear for you to choose.
Inside the prefs folder delete the plist files relating to LR6. There are normally two (see image below) so send them both to the trash.
The re-launch Lightroom again. Let us know if that helps.
Did delete the 2 plist files, and a third on (lightroom 3).
It did not help. After forcequitting LR6 again, on LR^ plist file had been created again.
Great, thanks. LR works again!