I was viewing some PDF files on a PC and came across  a rather odd result. The PDFs were displaying text very chunky. An example is to the right.

The document prints perfectly; it is only the screen display that is chunky.

To fix this go into Adobe Acrobat Reader menu option Edit -> Preferences then in that in Page Display under “Rendering” make sure that the “Smooth Text” is set to something other than None. This fixes this issue.