So I ran into a frustrating situation lately where my users when they tried to open a pdf in SharePoint, it would launch the pdf in the browser correctly, but at the same time it would open acrobat reader in the foreground with an error message.
This was aggravating, because I could not figure out what setting I needed to modify in order to force acrobat reader to go away without digging deep into acrobat reader.
Well turns out the solution is pretty easy to fix and has to do with an add on in IE.
To correct this issue, go under IE, then manage add ons. Then find the following add on:
Select this add on and then choose: “Disable”
Once you do this, then close the add on window, then all your pdf’s will open in the browser window without getting acrobat blocked any more. 🙂
Hope this helps! Enjoy!