If you are opening your digital publication and the displayed pages are blank, this could be caused by a Javascript error that occurs when users input Javascript code into Publisher that is incompatible/incorrect and will need to be amended/removed.
To access the Javascript, click Settings, then General
From here, scroll down to the Redirect URLs for mobiles section and amend/remove any Javascript that appears in the field as displayed below.
Be sure to hit submit at the bottom of the page to accept changes, then generate a new preview link to ensure that your changes have gone through. Finally, republish the live link to push your changes to your readers.