For more information see here Bug Report Template Build: 1.9.3 4018 Mode:Creative Mode:Single Player SERVER NAME: SEED-ID: If applicable: MODIFIED PLAYFIELDS: Reproducibility: Always Severity: Minor Type: Signal Logic, Area switch,LCD Screens, windows Summary:Survival Build menu undo bug. Description: When using Copy paste of a entire structure to another structure, if hit paste once and then hit UNDO, followed by paste again. it clears out all window orientation, signal logic, set area of effect for area switch and LCD screen text in the new addon. It has to be all redone. IF do not hit UNDO i will not clear out signal logic, area switch area of effect or lCD screen text. Steps to Reproduce: 1) copy a structure in creative 2)paste it to another 3)hit UNDO 4) hit paste again 5) checking structure the new addon all window orientation, signal logic, set area for area switch and lcd screen text are missing