PDFs on my system work fine. They display in IE no problem.
In adobe reader, I've set the pdf to open in a separate window by unchecking the "display in browser check box"
After no luck with the firefox options Ive downloaded the add-on "pdf-download" and set it to display\open pdfs in a new window, but this still doesn't work - I get "the adobe acrobat reader that is running cannot be used to view pdf files in a web browser...try again"
I had some luck getting this to work by giving the user admin rights, but have failed to find a good consistent solution.
any ideas are much appreciated.