I'm sure I'm not the only one here who's been quite annoyed by the fact that selecting a part dropdown and not changing anything results in the car being reset. After a lot of tireless debugging, I finally fixed it. 'art/gui/LuaChooser.gui', line ~78: Code: %this.borderSize = 5; %this.currentValues = new ArrayObject(); // this is the troublemaker! } else if (%this.numControls > 0) { %this.reset(); } %this.mapValues = new ArrayObject(); %this.dlgs = new ArrayObject(); The fix: Code: %this.borderSize = 5; } else if (%this.numControls > 0) { %this.reset(); } %this.currentValues = new ArrayObject(); // move it here for profit! %this.mapValues = new ArrayObject(); %this.dlgs = new ArrayObject(); I have attached a fix below. Enjoy!