I installed and updated Leopard, and I can't open any PDFs in Safari. Clicking on a pdf link leads me to this dialogue box: "AdobePDFViewer cannot find a compatible Adobe Acrobat or Adobe Reader to view this PDF." it then proceeds to ask me to select a program to open PDFs. Apparently PDF support is supposed to be native to Leopard. Not for me though. EDIT: I have found the solution.