Just wanted to report this in case I'm the first. I'm running the latest beta of TA on a WinXP machine (P4-2.8ghz, 2gigs DDR4 RAM, 9800PRO). My galaxy size is set to immense. I've been developing large fleets of constructors mixed with my huge and large battle ships. I have max logistics so I get as many constructors in there as possible and then I set the course for Torian homeworlds and build Terror Stars.
The exact time that it quits to desktop is usually when I disband the fleet and/or re-create the fleet after a successful disband. But I believe it also did it when I first built the Terror Star by selecting a constructor and telling it to build. Once i did this for one then the other constructors automatically followed suit and I built the Star. Then it quit on me again.
OTHER BUG
I also seem to have a problem creating fleets sometimes. I have been using the new equipment for the ships like "Fleets of Haste", "Fleets of Wrath" etc with the Krynn. I put one on each major vessel. In particular I can't seem to get my medium sized attack vessels to fleet together. I can mix ships with those vessels in a fleet and I can fleet many of my large-sized battleships but I have problems definitely with one medium-sized and one large sized that are both equipped with these modules.
Thanks... Might I also take this moment to add that this expansion is utterly amazing and even more engrossing than the other GalCiv2 versions by far. The uniqueness of each civ is just fantastic.