In Sharepoint 2010, by default you cannot open PDF files in the browser from Sharepoint because it has a tag it attaches to every unknown document type that tells IE not to allow the user to open it in their browser, and to save it instead. This can be disabled, however, and PDFs can be opened in the browser, according to this: Technet Social Post
I've changed that setting, and while I can open PDFs in the browser for SOME document libraries, others still only give the choice of saving it to disk instead of opening in the browser. I'm logged in as a domain admin, and domain admins are owners of all the sites in our Sharepoint config, so I don't think that it is permissions.
How can we get it so that ALL PDFs open in the browser instead of forcing the user to download them?