I was importing photos when I got the message that my disk space was critically low. The importing of my photos stopped, so I cleared space on my disk in order to continue importing. When I went back to Lightroom it was unresponsive. After numerous failed attempts to jumpstart the importing I closed the program. Now I can't open Lightroom at all. Lightroom is also stopping my Mac from restarting or shutting down. Any help would be appreciated.