I installed Adobe CS3 Design Premium on my MacBook this weekend. Since then I have been unable to open PDF files in Safari. Here's what happens -- 1 - I click on PDF file to view. 2 - I get a dialog window that is titled "Select an Adobe viewer for this PDF" 3 - Click over to my Applications folder 4 - I cannot select "Preview" because it is grayed out. Preview still functions perfectly as a PDF viewer via Finder. I have PDF files set to open up in that application. Any thoughts on how to fix this?