A number of my users are complaining ever since an upgrade to IE9 that when they click a PDF link, IE gives the error 'Internet Explorer cannot display the webpage' (ie doesn't even call Acrobat Reader add-in). I can view the PDFs just find in Chrome, I can download the PDFs and open them with Reader just fine, but IE gives me that error when trying to open the PDF link directly.
Where can I start? I've already seen the 'use FF instead' option so I don't need that :)
Known bug.
I've seen that this may be resolved by ensuring users are running the 32bit version of IE but YMMV.