I can't open any Adobe or .PDF files in my course

Please make sure that you have the most current version of Adobe Reader installed. You may Install/Update that for free here: http://get.adobe.com/reader/

There are currently known compatibility issues with embedded .PDF files in Safari. We recommend you download and use:

Firefox: http://www.mozilla.org/en-US/firefox/new/

Or Google Chrome https://www.google.com/intl/en/chrome/browser