My prezi is disappearing in present mode. It is only showing the background. It moves through the steps but shows nothing.

I have a workshop tomorrow that I am giving.  I am attempting to download my presentation for use without internet.  When I go into present mode to see how it looks, there is nothing there but the background.  It moves through the steps, but shows nothing.  I need HELP NOW!!!!! I am presenting at 7:30 am tomorrow.