The demo loads and runs fine, but its like its always night, even on the main menu page where your player stands its dark, I can see silhouettes of the trees and the player but nothing on the ground, its the same when I start a game, I can move around, pick things up, craft, but I cant see where I'm going.
I tried /settime this lightens the sky a bit, but its not a true sky, no stars or clouds just black or grey. as I move mouse I can sometimes see my player in her underwear, I can see what I pick up in the inventory and on hotbar.
Am running win7, i5-760, gtx275hd, 8G ram