Adrian, If you're using something earlier than Adobe Reader DC, try opening the preferences for Adobe Reader and going to the "Internet" preferences. There used to be a checkbox there labeled, "Display PDF in Browser," which was checked by default and needs to be unchecked.
Since doing the same thing I recommended earlier Chrome is now attempting to download and save any PDF link I click rather than opening it in my chosen PDF viewer. Based on what I'm finding out there this has been a recurring problem, but at least it gives you the option to save the file and then open it with your PDF Reader of choice. What version of Windows are you on and what Adobe Reader are you using. It's become more than a bit complicated to disentangle browser, Windows, and Adobe tweaks necessary over time, much to everyone's chagrin. Brian
