Safari doesn't display pdf file from within Dropbox

When I click on a link on a web page that takes me to a pdf file located in a shared Dropbox folder, Safari only gives me a solid black page and doesn't open the pdf file. All the other browsers do, Chrome, Firefox and even IE. How can I fix this? I have Mountain Lion and the latest version of Safari. Pdf-plugin-244 is installed. I tried the suggestion in another posting about viewing pdf files in Safari, and it didn't fix the problem.