Ah, lessons... so full of random moments.
Moment 1 from last night:
We're dancing waltz. Pro indicates that we are going, so I go... and he stops, not liking the way that I went

Long discussion ensures about what exactly he didn't like, with me asking a zillion questions to try and figure it what he was trying to say... including a moment where we switched roles and danced the begining of my routine, with him in [his version of] full stretch.
Conclusion: I was creating a little too much space for him on the opening half natural, thanks to my really long legs. Taking a slightly smaller step took away his sensation that I was 'running away'. Had nothing to do with the speed at which I transferred my weight, and I wasn't doing anything odd with my upper body.
Moment 2:
We're still dancing waltz. We're doing the wall where I hang out in a big shape and we whip along in pivots... as mentioned in the practice thread, we've changed my 'neutral' position to be bigger... and pro reams me out for "standing up" (aka, going back to my old position). I can't really argue because, well, I did... but we have a talk about why. Basically, the 'new' position feels incredibly vulnerable for me. I'm hanging out in this big shape, looking at the ceiling and unable to see where we are going... and as we whirl in pivots, not only is my head way outside the circle (a little disorienting), I can sense that the wall is coming kind of close to my head... so I got scared and 'stood up' to where I feel safe.
Pro's conclusion: "It's good that you're scared."
So helpful.