It was divisions! I rebuilt the surface with more divisions and everything worked fine.

Gracias

OK, here goes:

I've got a lofted surface that looks kinda like a box. I need to lattice it and make it squish down, but two rows of lattice points in the middle aren't responding to movement or...

it was construction history. I knew it was something minor. Thank you, valiant one, for your help. :cool:

all of a sudden lofted surfaces have stopped responding to changes in the curves they were lofted from. I tried starting a new project, but the problem persists. Did I unwittingly change some setting...