Mavproxy crashing with Windows 7

I’ve been trying to use Mavproxy with SITL on Windows 7 but it crashes with the display below. I can get it connect TCP :14450 however after a few seconds it disconnects.
I’ve tried fully deleting and reloading the latest versions of both Mission Planner and Mavproxy

Sorry revive an old post of mine. I’ve been playing with Mavproxy and Mission planner SITL and Mavproxy disconnects from Mission planner after about 30 seconds ? - I’m using TCP both running on same Win 7 machine.

Is it a problem with Mission Planner, Mavproxy or something else ?