The option to load or start a new Single Player game is greyed out after a fresh install of Warband 0.860. I am willing to bet that this won't be fixed until tomorrow
afaik .850 or .802 or something, by mistake, had the singleplayer activated if you downloaded it from certain sources. Just wait a few days till the full version comes out. Then you'll have singleplayer again.
I downloaded the package from D2D and recieved the sp access. As far as I knew, Single Player beta was included since it was not made clear on D2D what type of beta access you recieve. I assumed that beta meant all inclusive.