Symptom 1: You are using Internet Explorer 9 and you get a blank screen when trying to open a PDF.
Solution A: If you have Adobe Reader 9, there is not currently a fix. Please request Adobe XI to be installed. Your walk-around is to use Google Chrome.
Solution B: If you have Adobe XI installed, you need to run the program first to accept the terms. (Look for the program by pressing the WIndows/Start button.)
Symptom 2: A PDF file on your desktop, My Docs, or other folder will not open in Adobe Reader.
Solution: If a box opens to select a default program, select Adobe Reader. (You may have to expand to "other programs".) There is also a checkbox to select always open with this program. Check this box.