No change here, game still goes boom.
Give me a few minutes to download the DLC and I'll give it another try.
In the mean time, can you verify your Steam GalCiv3 Integrity Cache? (Go to your library, right click on GalCiv3, go to Properties, click on Verify Integrity of Game Cache.)
<edit> I got it past the stuck turn, but kept going for two more turns to troubleshoot it. I got a CTD on the second turn when I tried to move a fleet. I don't think I can help you on this game. Sorry. </edit>