I have several pdf's uploaded to my media library. When I insert the file url into a page or post and click on it, the browser connects to the url, but the page displayed is blank. I've not had a problem with this in the past. Other media files display with outproblem (jpg for example).
I've tried in Safari and Firefox, same result.
I recently upgraded to WP 3.4.2 but can't say for sure if the problem pre-dated that upgrade.
Thanks for your help!