Hello all,
I just wanted to let you know that I've just encountered the problem... And it seems it was quite the same thing as spate. I was doing the tutorial mission (the last one), and I remember having a check at the watch on the upper left portion on the screen. Last time I checked it was about 58 minutes playtime. I didn't paid attention to the soundtrack, so I couldn't tell on that end. I was about to take over another planet, with a fleet of 421 ships (against a planet with 300 ships on the AI side) when it locked up totally, forcing me to force shutdown. I don't know if it saved in the demo (was trying to figure out if I would like the game, which was the case until it froze... :s), and I thus don't know if I could play where I left, or somewhere near...
I don't have the demo version out of steam, and it was quite easily that I found the logs. I found two logs, which I can post here. I hope this will give you a clue about what's going on, and maybe, a future patch :-)
Thanks for helping solving this out,