I have found that if I wait a sec for it to stabilize after the Pause, then hit P, then F5, then wiggle the throttle (I guess that almost anything would do), it begins to respond. So where I used to not be sure how to start, I now have a set of steps that work. Might just be that my system is busy right after starting a mission. From the time that I see the pause msg to being in control is maybe 2 s...so I imagine that the longer delays that I thought I saw originally either somehow smoothed out OR I didn't know what I was seeing at startup. But hitting P, F5, throttle certainly gets the ball rolling about as fast as I can do those steps.