Lost my Prezi can you revert back?

I was working on my prezi I few days ago. When i tried to change change the size of the frame I had my items in the entire thing disappeared. Is it possible to revert back to an older version?

This is the editing link: http://prezi.com/_7yfim_i8jtm/edit/?a...

I was working on the online editor with Google chrome in windows 7