Pointed out by the inestimable Ainsley, an excerpt from the Victoria Electoral Commission website
"How many boxes do I need to number if I vote below the line?
Voting below the line in the State election is different to voting below the line for the Federal Senate election, where you have to number every box. In the State Upper House election, you only need to number at least 5 boxes. You can then go on to number as many more as you wish, after having numbered your top five preferences."
Take the time folks, its worth it to try and short circuit the party-based idiocy that got us a Family First Senator at the Federal level. Really. 5 minutes every 4 years - you spend more time trying to decide between ice cream flavours.