Last week, I tried to log on for the first time, but the interface crashed immediately on launch. I tried again today, and it launched, so I was able to do mess around. But now it is crashing on launch again. I have no idea what would be causing it.
FYI, I am on a 2013 retina Macbook Pro, and using a 2560x1440 Thunderbolt Display as my only display. Still crashes when the display is disconnected.