Thanks guys! That was super helpful : )
Hey, this might be a case of sloppy coding on my part. That particular pen was originally built using CSS animations and the Greensock stuff is pretty much retrofitted, so there might be weird issues where I have missed to clean up my CSS causing the app to go haywire.
With that said, I've had several weird issues across the site the past few days. Sometimes the fonts all revert times new roman, sometimes when I'm browsing the popular picks the preview won't load in editor mode. I'm using the latest Chrome on OSX Mavericks