What is your screen size? I was building a PC yesterday, started it up after doing everything I needed to do, installed BlockLand Retail, started the game, one the command window showed, but the other one wouldn't, but it would show as game started.
Issue way, I had screen resolution 800x600, the game, by default, opens bigger and windowed (not full screen), so it wouldn't display, I had to increase to screen resolution to go into option in the game, and reduce the size of the window of the game.
Hope that helps.