I've been playing the last two days with no radio on and had no problems other then a little lag around major scene changes. Today I started using Dark Star radio, the first time the game locked up with audio still playing within two minutes and I had to restart my computer. So I figured I'd test it again, within five minutes everything the same with the Dark Star radio on it crashed again. Crashes with the radio on seem consitant, though I have no idea why but I couldn't find any bug report about this so I am making one.