Crash after updating to RC1

I’ve updated yesterday to RC1 4.6.0f1 and worked all day in my project trying to create a selection list of buttons at runtime. Today when I tried to open the unity editor it crashed after reimporting/recompiling again the project. I don’t understand what was left to re import/re compile when i just closed clean and with no error.

Case number 647571, no project included because it has 12GB.

Happened to me too. Just updated to RC1 and project crashes when hitting Play even with an empty scene.