I have an issue with one of my supported designers, he is using Acrobat pro DC to sign large formatted documents. Other users with acrobat XI & X pro don't have any issues with resolution this happens with all PDF's he opens but the larger the worse it is typical size is 120x36in. I should add that if he is just viewing the document it's fine it only blurs when print and sign tool opens.
any ideas besides downgrading him to XI 