Everything is buggered.
Not sure what happened, but I just recently noticed a small update in SE - no info on the page about what it was about, but since then, all hell has broken loose.
None of my ships fly properly anymore... When pressing space bar to go up, my back end rises, but the nose of my ship drops to the ground.
When I paste a vehicle slightly above the ground so that it drops to the ground onto the wheels, it just sits in the air and acts like a supported grid in mid air.
When I paste it within reach of the ground (on planet with gravity) and activate pistons, the pistons drop into the ground, but the vehicle remains where it is.
I have no idea what the build or update was, as it did it automatically and I only noticed it on steam download page. Usually it's full of my mod updates, but this was a program update so I don't know what version to revert back to without losing my build.
Would really appreciate some help with this.