I'm stumped and can't find the answer. I received an email with a pdf attachment. I selected it and chose "preview." It was almost unreadable. So I downloaded it and the poor readability was the same. I thought it was the sender's pdf, but when I got home I opened the email on my desktop (windows 8.1). It looked fine. Clear and easy to read. There must be a setting on my Note 4 (with 5.0.1) that is causing this, but I can't find it. Any ideas?