If I cheat it into existence I have no problems, but if I build it properly from a factory spring freezes and I have to shut it down. The first time this happened, my computer froze to the point where a windows error box told me Ctrl+Alt+Del wasn't going to work and that I should shut off my computer... hadn't seen that kind of error before

Most recent infolog: http://pastebin.com/bBfF7Ewf
CT build is most recent, 1667. This only started happening to me today (committed 1667 today) but I imagine it was present earlier (probably never tried making this unit from a factory since the engine update) Tried with an earlier revision and the same thing happened.