The file The Mole on PIRAD ONE - 1e.pdf appears to be completely blank.
Hey Demonskunk, are you using the OSX or Apple previewer to view these files? Very rarely for some folks using Macs, the default pdf viewer does not display the contents of the files so a reason I've not been able to determine/replicate. If so, try grabbing the free Acrobat Reader download from Adobe or another alternative and it should all display for you as intended!