Having trouble opening PDF files? It may be due to your Adobe Reader X configuration. Try this:
Start Adobe Reader. Click Edit, Preferences

Click Internet.
Select the checkbox for "Display PDF in browser".

Click Security (Enhanced).
Ensure the checkbox is selected for "Enable Enhanced Security".
Click "Add Host".
Add www.fellenius.net as a trusted host.
Click OK.

You should now be able to open PDF files from this website.