Just had an issue locally where Preview v5.0.3 (504.1) was not opening up the browser when you click on a link in a PDF where link text did not contain the protocol even though the backing URL of the link in the PDF did contain the protocol. You can right-click on the link and open the browser fine though. And, it only seems to happen with some PDFs (maybe those created in Acrobat- not sure).

This is a difference between Acrobat Reader and Preview's interpretation of the URL according to the PDF's author.

Does anyone know if this is a known bug in Preview and whether it was fixed in a later version?

Also posted here: https://discussions.apple.com/thread/3051151