Not sure if this is a problem with the ISY (running 5.0.16C) or one of my insteon devices, but I just tried to solve a problem where my remotelinc was not controlling one of three devices (an Insteon LED bulb) in four scenes (a, b, c, and d assigned to different scenes. It was setting this bulb to 100% in all scenes, though it was only 100% in a.) I tried restoring both the remotelinc and the bulb but no changes. I removed and re-added the bulb to each scene, no improvements. I factory reset the remote linc then restored it, no change. I finally removed and re-added the remotelinc as a controller for the scenes, and that finally fixed the problem.
Bruce