Hey Ferram, first of all, great mod! (Also I can only use a phone for this at the moment, so apologies if this has been covered) I've been playing 12.5.1 (just noticed you've updated but haven't had a chance to try it yet) on a modded .23, and if I set a Pe to ~20k to reenter, once the ship gets to around 68k the ship starts to 'vibrate' around an axis, so much so the G meter maxes out and the ship slows to around 60m/s (if it hasn't disintegrated). If I manage to get a parachute out, it still vibrates, but then some strange interaction between the parachute and the vibration can end up making the ship climb back up at a rate of up to 100m/s, then back down, then back up again. This happens with stock or mod parts. If I plan a 40km Pe, this doesn't happen. Sometimes this vibration will fire the ship out on a kabillion m/s route out of the system. Luckily Jeb had stayed behind on board Salyut. I also removed FAR and it seemed to be fine, then returned when I reinstalled it. I don't use any other mods that do anything like FAR, as far as I know. I'll try the update when I get a chance, but thought I'd post so you're aware of it. Thanks for the great mod. David