YOU MAY ONLY VOTE FOR A GIVEN PROGRAM ONCE PER REGION; your #1 choice cannot be the same as your #2 choice, etc. – when you submit your vote, the electronic ballot will return an error until each program you select in a region is unique.

I was able to vote twice for a programm (vote #1 and vote #3) using FF 9.0.1 with XP

And I had to select something in a categorie, I got an error message, if it e.g. do not enter anything in a group (e.g. rental cars in Asia pp)