Currently using Lightroom CC. Today, every time I tried starting Lightroom, very shortly after the start and before you could do anything I was getting a message saying that Lightroom experience a problem and needed to close. Not a very helpful message. Having checked that I had the accelerated GPU turned off (because of support for my graphic card) I couldn't find any other reason for it not to restart. But I did remember that my new Sony Xperia Z5 Compact was connected to my PC. Disconnecting this solved the starting problem. I hadn't referred to the smartphone but it was being picked up in the Navigator. Fortunately I could download my photos by other means.