The computer shutting down is usually a driver problem or a hardware problem.
Re-install your graphics driver. Check all your hardware for possible malfunctions (run diagnostics on your HD and memory)
This is a wide spread issue on a Mac and Lightroom CC 2015.6. Can you confirm that you have 2015.5 and not 2015.6?
I am also having this problem with 2015.6. I called Adobe and got a temporary fix but the problem returned!
The problem seems t be associated with having several EHDs connected to the computer while trying to import. My workaround involves disconnecting all EHDs except for the one to where I plan to copy the imported photos. I have also turned off the option to have Lightroom open when an SD card is inserted. Before inserting the SD card, I click the import button; Lightroom seems to handle the one EHD OK and asks me to choose a source. I then insert the SD card and Lightroom sees it very quickly. I then check "Copy as DNG" and check the location to be sure it is correct (Sometimes it is not). Import proceeds well after this process. It is a pain so I hope Adobe will fix it soon.
I do indeed have 2015.6
The weird part is after re-booting the computer the import process works fine, normal as before. The next time I try to import, the lock-up happens again.
I trust Adobe is working on a fix?????
It's been more than a month that this new Lightroom feature was introduced.
I find that the unpredictable failure to import and intermittent crashing of my machine has given me a lot of extra time to contemplate other things. It has improved my productivity, my attitude, and my life in general. I get to speak with clients more often. My customer skills are improving because I get to explain missed due dates. I also get a lot of time to review my old work because who really wants to go on a shoot when you don't know if you will be able to upload it?
And I am absolutely thrilled when it does an import correctly!
(So much for the sarcasm.)
You could call Adobe product support, be told to disable all the advanced features, uncheck the enable GPU box, remove all external hard drives, re-install Lightroom, check your permissions folders, or finally arrive at the only solution that appears to work- roll back to a previous version of Lightroom!
If you search real hard you might find that thread from about a week ago saying that they had found the problem and are working on it. No comments from LR product management or the Customer Advocate.
I feel your pain and had a different expectation from Adobe as far as my productivity and creativity is concerned. There’s always those rewarding calls to India if you feel lonely.
Just built a machine JUST to run LR and PS. 2 ssd 2 video cards runs great. Really fast. Only thing I have loaded is the new installs from adobe.
CANNOT IMPORT ANYTHING!!!!!!!!!!!!!
Just glad I dont use this to earn my living like some of you. Cannot express the level of my disappointment.