I upgraded to Safari 5.7.1 and after that I cannot load pdf pages any longer. Prior to that version, pdf pages would load as usual in "Safari" format. Now, if I want to see the pages I need to control click the URL and ask for the pdf document to be copied in a folder. If anybody has any ideas, I would appreciate their input. I can always go back to the previous version with Time Machine.
Go to HD > Library > Internet Plug-Ins
Move the Adobe PDF Browser (or just PDF Browser) plugin to the Trash.
Quit then relaunch Safari to test.