Comment 19 for bug 772817

The same for me. I was trying to find any information about how could I hide the launcher (it didn't hide even with 'autohide' option on) and I found this page. I tried to press numlock and the launcher magically hid.
I have also tried what computermacgyver says (with nautilus open and numlock on, unity appears even it was hidden before), and I had the same behaviour.