I just installed Lightroom 6 using the Creative Cloud portal. It would not start. I un-installed it and installed it again but no luck. Is this an early feature of Lightroom 6?
I have same issue on my laptop. Desktop works just fine. I'm scratching my head too...
I found the solution on this by searching the forums: sign out of CC and then back in again.
Thanks. I did this and all is well.