Re Mission Planner evaporating, this is happening to me again although only in very specific situations. I must be running Copter-4.1.x on a Pixhawk1 connected to my main PC. If any of these things are changed it works OK. So for example I can connect fine from my laptop, or I can use 4.0.7 or I can use a CubeOrange and it’s fine.
I’m working with @meee1 to try and narrow down the issue but no luck so far.