Everything I want to ask is already here:
So why? And what is the best solution?
The just-released CC 2015.2.1 fixes only some of the many problems with CC 2015.2. Unless there is a very specific reason you need 2015.2, you're probably better off reverting to 2015.1.1 until Adobe fixes the remaining problems. See this article for instructions: http://www.lightroomqueen.com/how-do-i-roll-back-to-lightroom-2015-1-1-or-lightroom-6-1-1/ .
your update managed to make the crashing happen immediately now instead of after the load screen...soooo it's even a MORE efficient bug?