margin

[Robin Gerard]

Hello,
I have installed lyx-1.1.6pre3 without problems, 
(potato Debian) it's  very very good Work !
but I have a problem when I do:
layout --> document --> paper
if I put a value in one of the nine fields:
haut(top),bas(bottom),gauche(left) etc...,
after then, I can't use the command: OK, Appliquer
Tey are inactiv.
Thanks in advance for your help.
Gérard.