If you are using PDF files in your Blackboard courses in either Safari or Firefox browsers, you probably experiencing frustration when they don’t appear.
The solution: Use Google Chrome or the Schubert IT PDF plugin (from http://www.schubert-it.com/pluginpdf/), recommended by the Blackboard Learn user community, and is free for educational use. Once installed, restart the web browser, and it should be activated.
Safari and Firefox browsers try to use a non-existent PDF plugin to display the PDF file. Clicking on the “Missing Plug-in” returns no results, because Adobe has not released a PDF plugin for Mac OSX. Google Chrome has a built-in PDF viewer, which correctly displays the embedded PDF file.
Until a permanent solution is delivered from Blackboard, the workaround is to install a third-party PDF plugin.
Recent Safari [version 5.1] and Mac OSX software updates [OSX 10.6.8 and OSX 10.7] have removed the download/viewing capability of PDF documents using Mozilla Firefox and Apple Safari browsers. [Details found at http://kb2.adobe.com/cps/908/cpsid_90885.html ]