If you’re seeing results where there are visits but no page views, these are probably visits where non-page files are being requested and nothing else. Here are a couple of custom reports that will help you figure out what’s going on.

Betcha didn’t know there are so many ways to affect this.  Usually you won’t care, but you might.  I don’t think anybody has ever listed them all side-by-side. 

Suppression of all query parameters — this is an on-off toggle in the Page Files Types and Download File Types screens, called “truncation.”  When truncated, the Pages report (and [...]