I'm not sure if this is the place to post this, or if it's already been noted, but all the modules with crew capacity have a small bug with the .21 update. When you add them to the ship, and then take them off again, the slots in the crew management page remain, and if crew was added to that part, the game will become unresponsive when you try to launch the ship. It's a small bug, but I thought you'd like to know! EDIT: Nevermind, seems too be just a general bug, nothing to do with this mod. Sorry!