Hi,
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.

This also happen on my hEX, system health shows nothing. I have tried downgrade to previous stable, but issue still persist. I have email support about this, their reply mentioned about trouble with factory installation/calibration.

I will try to downgrade to LT release to see if it's really resolve this issue. Thanks for your information.