Tesla has changed the behavior of manually controlling the suspension height over the last few versions of FW. The last few versions, I've noticed that you can raise but not lower the car without all doors closed. I guess they assume if the door is still open, you've probably got a limb or two hanging out the door (always true for me, since I'm just reaching-in to change the setting) that could get crushed. I think it's a good move, but as others have pointed out, a message to close the door would be a lot more helpful.