I've encountered a similar problem (and I am running the Opt-In):
A minor race wanted a commerce tech from me; but I declined to just give it to them. So, I go into diplomacy and trade that tech and "Soil Improvement" for a defense tech and a constructor. All goes well; they like and accept the deal and "wallah" I have a constructor right where I need it.
Oh, except for one major problem: I click on the constructor and the game crashes to the desk top.
It's bad enough that every time I quit playing I have to power my laptop down and back up in order to use the internet; but now I can't make that deal that would've been perfect for that point in time.
It's not just a fluke either; as I have an auto save that occurred right before that turn. Reloading and trying the same thing again ends up with the same results; although I can move all my other ships first and such. Clicking on that Constructor though ends the game!