I have 'reset settings' in LR preferences due to the problem of having to force quit each time I use LR:
I click quit LR
The 'back up this time?' panel comes up, I hit 'not this time'
then the Lightroom heading( upper left screen next to apple icon) becomes deep blue in colour
LR then won't shut down (the quit option in drop down menu fades so i can't click on it)
Then I have to force quit.
Any ideas? Thanks
Update your LR to LR 6.3 /2015.3 - http://blogs.adobe.com/lightroomjournal/2015/11/lightroom-cc-2015-3-6-3-now-available.html
If is is already up to date, then move your catalog on desktop and then the behavior of LR.
Thanks - seems to be sorted now. Updated it doh!