Hi, thanks for your great work.
I am testing it and found that I could not deactivate VNAV from the MCP, this caused that I couldn’t select the altitude manually, it returned always to the FL specified in the flight plan.
Clicking on the VNAV button of the MCP does not turn it off, it remains green.
I disengaged the autopilot and suddenly after a few minutes the VNAV button turned off.
I couldn’t even complete one flight.