Hi David-LMCA
We are aware of issues printing from Chrome webpages to PDF Manager. Users can receive a typecheck error on the last page. This is due to the latest Chrome update.
We aren't aware of any issues with Edge or Firefox. The problem is webpage specific and doesn't happen for all sites/pages. For more information please refer to KB- Error: "typecheck" when printing to PDF Manger in Chrome- http://help.myob.com/wiki/x/AgDqAg
Based on the information below your users are printing PDF files and not webpages via the browser, so I"m not sure if the browser is causing this issue.
We recommend importing PDF files and not printing these to PDF Manager. When you print you will lose bookmarks if they exist and the final document may not be as good as the imported version.