Its probably not a bug just not the most intuitive issue. I struggled myself with the rotator til I figured out two key points.
1. You must make the default menu item - OFF and then enable it where you want to see it.
2. (and this was the one that hung me up). For the places you want it off DO NOT create new custom gantry settings. Check the menu assignment on the DEFAULT template. For some reason if you create a custom gantry setting by menu item and set the rotator to off it just ignores it.
Hope that helps. If not make sure to see the panacea section of the forum where this is a great guide on the rotator ins and outs.