One issue I found: if an AI race surrenders and "wills" its ships to other players, and those ships are upgrading, they can become unusable. I couldn't cancel a 161-turn (!) upgrade taking place on the other side of the galaxy, and I had to scrap the ship.
Also: how do I get 1.50X.072? My version of Stardock Central doesn't find it?!?!
Thanks,
Jon