I'm running 64 bit on Nvidia GeForce gtx 660
step by step it literally is as I said b4,
1st time-made track and used auto complete for one last straight section, closed build menu, then froze and said tps not responding.
2nd time- made track also using auto finish. closed build menu. connected path to station, then froze.
3rd time, same as above made track and auto finished. clicked test park, froze literally as I clicked the button to test park.
this was an empty park I was using with nothing but a go kart track in.