I have fiddled with the time, but I have done that since day 1 and I have been playing for at least 6 weeks with no problem. Why does the time changing mess with the your game? I would do it and then not do it, but it worked just fine and then it restarted 3 times in 3 days. I was super bummed. But I have now downloaded plant tycoon to my desk top. It is fun!!