Strange behavior. When I changed it before, everything was working fine. Now that I re-opened the file it doesn't work every time. Almost seems like if I stay messing with it and previewing for a while it works. Then if I close and come back later it doesn't.
By the way it works fine in Chrome, and I'm running in win7 32bits desktop.
Edit: I just noticed that for some reason it doesn't work in Firefox, only in Chrome.
Edit2: Forget what I said, it works randomly and buggy. Let's hope someone can shine a light on it.