I asked the same question of Marc Koval last week. My recollection is that the core pings HQ a good number of times a day( if not an hour) to inquire if there is a new software update, and downloads, if there is one. Then, it immediately looks for endpoints on the network and pushes out any embedded update to them (if there is a change to be made to the endpoints). In other words if the devices are all on the network and core enabled, it should work automatically. You have power cycled the endpoints after the core was switched back on after using Roon.
Is it possible the changes were limited to core control and not the endpoints?

James
NC1: 861v8, ID41, 218, 251(to outdoors), DSP8000SEUG, 7200SEC, DSP520 rears, Apple TV, DirecTV, Oppo BD103, QNAP251, Roon
NC2-M7005, Triad Silver Speakers,Acurus Amps

FL1: 861v4, ID40, 218, MS200, DSP8000SEs, DSP7200SEC, DSP5000s, DirecTv, AppleTv, OppoBD103, QNAP469, Roon
FL2: Marantz 7005, 251, M60s,60C,33s, Oppo BDP-93,MS200, Roon