We had one of those just now in a lesson that I wanted to share with you, Manny. And as so often happens, one good thought raises new questions.
I was reviewing one of the suggestions you made to me with her (making fishface...) and the question of mouthpiece placement came up. I helped her re-place her moputhpiece (she was fairly high...almost all upper lip), and then she mentioned what came to be our epiphany: (student) "Do you feel your teeth on the mouthpiece when you play?"
says I. How could I have missed that?
Anyway, to my question(s) (sorry to have taken the scenic route): 1. have you ever seen that before? 2. If so, how did you help the student solve it? 3. If not, any suggestions to help her?