The first thing I would do after a new (update or full) install of Mountain Lion, would be to run Disk Utility and let it verify/fix permissions and verify the drive. Then check if the in-browser PDF viewing functionality has returned to Safari.
The second check would be to look in your home directory in the Library/Internet Plug-Ins folder, and ensure it is empty.
The third check would be that you are using the latest version of Adobe Acrobat Reader (10.4.1) to have the most current Adobe PDF Viewer plug-ins installed. Older plug-ins may clash with the Quartz PDF plug-in that Safari uses by default; resulting in neither plug-in working in Safari. This may explain why Firefox worked fine.
I have both plug-ins installed and the Adobe PDF plug-in over-rides the default OS X PDF viewer in Safari 6. I find that the Acrobat plug-in offers more in-browser functionality for Safari.
Permissions were fixed after all migrated and while making backup
Main Library Internet plug ins folder has Adobe PDFViewer
Does NOT have the Quartz PDF plug in
Where do I get it?
My user (~/Library) Internet Plug ins folder has other needed plug ins (Citrix, Evernote, Google) Also has something called PDF Browser Plug in but it is old- from 2004.
I removed it
This Library has neither Acrobat nor Quartz PDF plug ins
Yes, I have the latest Acrobat x Pro and Reader. 10.4.1
Another post elsewhere on this Apple discussion area reminded me
in addition to the Adobe PDFViewer , there is another Adobe plug in, previously found to be a troublemaker
Identified as causing Safari problems several versions ago of Safari
THAT has to be removed and then Acrobat plug in works in Safari!
Thanks all for helping my brain think
You can get the following file (actually a special directory) from another Mac running Mountain Lion:
- /Library/Internet Plug-Ins/Quartz Composer.webplugin
Run Disk Utility again to let Mountain Lion fix the permissions on this file, once you have added it back.
In the same location, I have both AdobePDFViewer.plugin and AdobePDFViewerNPAPI.plugin. Both have a date stamp of Jul 27 (2012). I have no PDF viewing issues in Safari 6 or Firefox. I believe that Acrobat Reader updates now keep these current. I too am using Acrobat 10.1.4.
I believe once you recover the above Quartz PDF plugin, Safari will settle down and display PDF.
I found I do have the quartz composer web plugin in /Library/Internet Plug-Ins/Quartz Composer.webplugin
So that was not the problem) ( My date stamp is June 20, 2012
Removing the NPAPI Adobe plugin lets Safari open .pdf files.
That has been documented previously... Maybe I have other things on my Mac which conflict with this plugin- things you do not have.
FireFox has not had a problem with .pdf
I had the same problem and finally (!!!) solved it: Besides the NPAPI plugin there is another plugin called AdobePDFViewer.plugin
I removed (to desktoop) both plugins and I was able to view PDFs from Safari. Then I added back the AdobePDFViewer.plugin and black screen showed up again. Removed it and added the NPAPI plugin and everything worked as it should. So it is the old AdobePDFViewer.plugin that seems to be the problem.
BTW, it was always possible to download the PDF that you could not view. Just right click (or cntl click) on the black screen and the download (save) the pdf.
I have OS 18.8.2 and run Acrobat 8.1.3, and had previously also installed the latest version of Acrobat. But then I had problems with Firefox openeing pdfs. I trashed Acrobat 10.4.1 or whatever it was.
Maybe as a result of all these actions, Safari became sick and could not open the pdfs. Now I moved the plugins around as suggested by oldmacgeek, and finally found, that the AdobePDFViewerNPAPI.plugin was the problem. I may conclude that the Acrobat version used requires just one of the plugins, and that the presence of two different plugins in the related folder paralyzes the Lion .
Indeed (in response to Lewdvig), there are many things Apple should work on and actively come up to the users, e.g. the problem 'imovie & built-in camera'. So let us hope and pray!
I recently removed Adobe Reader from my Macbook Pro (mid 2012, running Mavericks) and it would also show me a black page in Safari (latest version) when clicking on a PDF link within a website.
The suggestion to remove 1) AdobePDFViewer.plugin and 2) AdobePDFViewerNPAPI.plugin instantly solved the issue!