So I have been having an issue with the FMC as demonstated in the video. I have tried a re-install with no sucsess. This happens on the ground, and whilst in flight. All other knobs and displays work. I am running the 2.1.1 update with XP11.50b6. I am going to try a flight rolled back to the latest non beta version tomorow, however I though I may as well post here incase it is a known issue.