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 scaling. When I try, the shading changes on the lofted surface, but it doesn't move. The rest of the lattice points respond fine to manipulation, but those two rows won't. I don't know what could make only some of the lattice points stop responding.

BTW, i'm doing project #2 in Learning Maya 5: Foundation (lesson 10).