I've been playing KSP since 0.23.5, initially without any mods, now with the following: Editor Extension Enhanced NavBall Kerbal Engineer Precise Node TAC Fuel Balancer Kerbal Alarm Clock The problem I'm talking about here is returning to a ship that's been on rails for a while, only to discover that it's way out of its original orbit. I'm all but certain that I saw this in 0.23.5 with no mods installed. At a minimum, it would be with only KAC installed, which I now consider essential to sanit