Cannot View PDFs

Even though I have set "view documents" to "yes" and included pdf in the viewable doc types, I cannot get the view document feature to actually work. When I click on the view button, it comes up blank with this as the URL: about:blank

You can see what's happening here:

www.americanfan.com/manuals.html

I am using Edocman version 1.0.5 in Joomla 2.5.9

I had this turned off for the longest time since it has never worked, but now I really need it.

I just checked and the document can be viewed properly. Please note that in order to view PDF document online, you will need to have adobe plugin installed on your web browser. Maybe you don't have it ?

Here is what I see while viewing the documentation at the page www.americanfan.com/manuals.html?task=document.viewdoc&id=9