I recently upgrade 2 of my HEX and 1 RB750gl routerboards to v6.48 stable and after the upgrade the system health show nothing. Previously It displayed input Volts and temperature. This happened on both of the HEX and on RB750gl as well. I upgraded firmware on 1 HEX to check if that will fix the issue but its still same.
Well I downgraded to v6.46.8 LT and now its again working fine.