Hi,
I'm not sure if I'm doing something wrong, or this is a bug, but... I'm flying with AP, VNAV and LNAV active (following FMC flightplan), just passed T/D and the plane started descending.
Now, I'm trying to reduce the speed via MCP: the IAS/MACH display is blank, so I hit SPEED button on the MCP, the MCP SPD is announced on the PFD, but the IAS/MACH remains blank and I still cannot dial in the desired speed... Is this by design?