I have the same problem but I wasn't in the beta. Came to these forums to see if anyone else was having the problem where I am starting it up for the first time and I get a white screen and then it gives an error. I have up to date drivers running a GTX 670m 3gig video card.
You should e-mail support with your debug.err file in your documents/my games/fallenenchantress folder. This will help them determine what the problem is.
Also, given that its steam I recommend you verify the cache.
