Squawk box and V sync

Hi guys.

It has been many many years since I last used Vatsim and I think I would like to again but have hit a snag with squawk box. I have installed it so I can have it running on a separate pc. All seems to work ok apart from when I connect on my laptop and the little squawkbox window appears in the cockpit of my FSX machine. When that appears Vsync disables and I end up with some frankly nauseating screen tearing.

I have spend ages this evening trying to find a solution. (one of which was to try and install FSinn) and the squawkbox forum has about as much life in it as a mausoleum but have not found the answer.

If anyone has any idea how to get rid of this please tell me. I simply will not fly with my screen looking like that.

I am using nvidia inspector.