Although you've figured out a solution, I thought I'd post anyway.
Mel commands often dont have the limitations the GUI has- REbuild surface, for example. Rebuild form the GUI allows max. 100 isoparms, whereas the Mel 'rebuild' command allows any number.
Its possible that the Mel command to create a lattice dosent have the 400-division limit. BUt I havent tried it...
CHeers
G
"Dont worry, They'll fix it in post.....Huh? what do you mean, 'We ARE post'???"