.I am running windows 7 on a powerful desktop with i7 proccessor 16 gb memory ..... it is dropping reference to my catalog.. when I go to the library module instead of reading import and export on the left panel it says import and export catalog. If I shutdown and restart lightroom it asks me to select the catalog. It is also messing up my mouse/wacaom device with either freezing it or losing the definitions of the buttoms i've set up. the 2015.2 release was also dropping my boot (c) drive which is an ssd and it took several attempts at rebooting before it was able to find it and reboot. This has happened twice and only with Lightroom running.