[President_Elect_Shang]

That is not unusual, changing the components file (and a few others) then resuming a saved game will cause that game to screw up. All you have to do is insert the items you made and start a new game. I am not sure what you mean by the “tech tree’ gets screwed up” you should check to make sure that the family numbers do not conflict with the other engines etc. Otherwise when adding new components and sometimes changing current components (depends on the amount of change) will cause a saved game to go nuts. Just start a new one.