Lightroom 6 worked fine, now I only get spinning wheel and it locks up the system. Does anyone have any suggestions?
Date/Time: 2016-09-02 13:02:00 -0400
OS Version: 10.10.5 (Build 14F1912)
Report Version: 21
Path: /Applications/Adobe Lightroom/Adobe Lightroom.app/Contents/MacOS/Adobe Lightroom
Version: Adobe Lightroom  (6.0)
Parent: launchd 
Duration: 1.00s (process was unresponsive for 578 seconds before sampling)
Steps: 11 (100ms sampling interval)
Hardware model: iMac12,2
Active cpus: 8
Fan speed: 1147 rpm
The first thing to do is update your Lightroom to version 6.6.1 and try again. No sense in trying to debug an old version, especially one this old.