Dear Support staff,
A few weeks ago I was flying the A330-300 and after about thirty five minutes in to the flight I noticed that I could not get the EFIS mode selector and the range control switches to work. I wanted to select the Plan mode and change the Range mode and discovered that when I utilized the relevant switches the display on the ND remained the same and would not allow me to effect changes on the EFIS. A couple of days later I used the 330 again and the same problem occurred, this time prior to take-off. I then uninstalled the aircraft and reinstalled it, and attempted another flight. The EFIS problem persists and I wonder if you can tell me why this may be happening. When I purchased the aircraft there were no such problems with the system.
Thank you for any assistance.