well, that's embarrassing for Tivo Rep's training dept, eh?
are both running the same software version? a version mismatch certainly wouldn't help things...
did you try different combinations of toggling it on on the Roamio, and then rebooting and or forcing a connection with either the roamio and/or the mini, then toggling it off, rebooting, etc?
I bet toggling it with the right combo of toggling, connections and reboots will straighten it out.
-Roamio Pro/Slide Pro
-Stream (Gotta go unplug the sucker one of these days!)