Found this thread because after a long time of playing without a problem, my launcher suddenly would not launch the game.
i7 4770K @ 3,5Ghz
2 x Geforce GTX780 3Gb
2 x 8Gb DDR3 1600Mhz
Samsung 840 Evo 500Gb SSD
So I read through this thread, and didn't really find anything that could help me, when I remebered that I had deactivated my SLi in the nVidia controlpanel the other day to show a friend a game that has some serious SLi bugs (so it has to be deactivated).
Re-activated SLi, and the launcher now starts the game
If you have dual graphics cards, you can try this out, and if you don't, maybe there's something else there you could mess around with and try.
[url]http://www.youtube.com/watch?v=h8C8nLy2okg[/url] Saruman 6-man
[url]http://www.youtube.com/watch?v=mj4h-CF9log[/url] Warden Survival