When previewing PDFs in the BQE web applications, the browser does not display anything and instead downloads the PDFs automatically.
The browsers do not have the PDF plugin or extension enabled on them.
Viewing PDFs within a browser requires that the Adobe PDF plug-in is enabled in it. Please read the instructions below to enable a PDF plugin in your browser.
http://www.opera.com/docs/plugins/installation/#acrobat
https://helpx.adobe.com/acrobat/using/enable-createpdf-extension-firefox.html
https://helpx.adobe.com/acrobat/kb/pdfs-safari-acrobat-8-mac.html
https://helpx.adobe.com/acrobat/using/enable-createpdf-extension-chrome.html
https://helpx.adobe.com/acrobat/using/display-pdf-in-browser.html