I'm trying to do a mission where I put a ship in orbit around The Mun. I built a ship (it has hinges, servos and telescopic poles), got it into orbit around The Mun, but when I create a save file while flying that ship, that save file will be forever stuck on a black loading screen. If I hit escape, it ends the black loading screen and shows the ship but the command pod is glitching and flying off. Same if I go to the tracking center, select that ship, and click 'Fly'. It will get stuck on a black loading screen forever, until I hit escape, then I can see the ship, but I can't play the ship because the command pod is glitching off the ship. I did try to EVA a Kerblin from the glitchy ship, and it immediately caused the ship to explode into 300 pieces.
So I tried building a different ship, put it in orbit, and ran in to the exact same loading error/glitchy pod problem.
What is going on?