I have no idea where to post this v6.48 bug thread, so post it here.
After upgrade to RouterOS v6.48, in WinBox(v3.27), System -> Health can't appear 'Temperature' and 'Voltage' correctly, GUI method,
downgrade to v6.46.8, this function works fine.
Hardware: MMIPS hEX (RB750Gr3)
I can't confirm other hardware has same issue.