When I power on the device, Overdub Mode is enabled. When I first got the device, I immediately loaded the latest firmware, and this was not happening at all. I have since saved a few patterns and chains, and at least 2 scenes, and the issue with Overdub seems to have cropped up in the last two weeks or so. I've tried saving both the pattern and scene with it turned off, but it's always turned on when I first switch the unit on. I've since done a factory reset and another firmware update, but am having the same issue.