I too had this problem where any time a kerbal was on the ship, the ship started out at 174 m/s. When launched would almost immediately lose control. Then when engines were cut, would slowly gain speed upward. If you tried to recover on the launchpad it would not let you and when attempting to exit warned that there was a ship in flight and would revert to previous autosave. If you attempted launchpad eva the ship would fall apart. Any suggestions on this account would be appreciated. With a non-kerbal computer controlled ship, no issue.