Keynote Presentation Disappearing Act

My Keynote presentation completely disappears when I click the hyperlink embedded on my slide. The link takes me to the website I want (which shows the results of an audience poll), but when I'm done with the website info, my presentation is gone! I have to go back into Finder, reopen the presentation, and find the slide I was on before I clicked on the hyperlink. Surely this isn't right. Am I missing something??