The problem lies on the IRS side. The current form http://www.irs.gov/pub/irs-pdf/f14438.pdf is intended to be opened in the latest version of Adobe Reader (you can't view it inside your browser).
Download the required program from www.adobe.com/products/acrobat/readstep2.html
Right click and save the PDF file to your desktop
Open the file from your desktop - not from inside your browser.