There are a variety of reasons why a printer might start printing blank pages. Have a look here and you'll be back to printing as usual in no time.

If Microsoft Word prints blank pages when trying to print a mail merge document, it could be caused by a problematic printer driver or incorrect settings.

What Causes a Printer to Print Blank Copies?. Running a profitable business takes careful cost containment. When you examine a printed presentation, reference document or other business content ...