You see, I just bought Universe Sandbox about 5 or so hours ago from Steam, and have had many problems getting it to load without crashing or freezing. It would take long times to load, (up to 20 minutes) and would crash in the middle of loading or freeze and crash just as it would get to the main menu.
I don't think that is the problem as of now, though. I got it work and honestly the main menu was very pretty and was like eye-candy. I loaded the tutorial and am currently playing that right now, but there is one major problem. Many things are just 2D squares rather than planetary spheres. All planets and asteroids, and pretty much anything that isn't a star, is just plain invisible. So far it does not look anything like the spiffy trailer, and is, for me, many colored squares arranged to look like galaxies and solar systems.
If it helps, I have Windows 7 and a DirectX 11 graphics card. I hope you can help!
(In the attatched pic, the brown/beige trail is that of one of Saturn's moons, but it is invisible, and the yellow circle in the background is actually the outline of an invisible Saturn.)