Ever since I upgraded to 4.0, with the beta and even official release (and subsequent update to 4.0.1) I cannot view PDF files. Safari three would automatically launch Preview. Now it does not auto launch Preview but does 1 of 2 things instead. It either asks me to launch a program that can open the PDF, but does not allow me to pick Preview. THe other thing it may do is just open up a blank page and does not display anything. I have not figure out a away to fix this. Thank you to anyone who could help.