Usually it is because you have upgraded to the version of e-Sword that uses html markup. If you still have user made modules that have not been converted to html, these are usually the ones that don't display in various places.
Note the update info from the e-Sword site for version 11.0
e-Sword version 12.0
New Low Light display setting to make viewing the text easier on your eyes.
New App Themes to further customize the e-Sword interface to your liking.
Hundreds of refinements throughout the app, including a rebuilt STEP Reader, improved Resource Options dialog and bulk printing/copying of Journal Notes in date ranges.
e-Sword version 11.2
This build includes the latest versions of third-party components used within e-Sword.
Many little enhancements and bug fixes.
e-Sword version 11.1
This build includes the latest versions of third-party components used within e-Sword.
Many little enhancements and bug fixes.
e-Sword version 11.0
E-Sword modules are now HTML-based! This change will allow many new and unique resources to be created for e-Sword. Don't worry, e-Sword will still work with the older RTF-based modules as well. Most of the resources have been updated to this new format, so you may want to download the updated versions of these modules, especially the non-English Bibles as they now contain the actual Unicode characters which makes for better search results. The new module format has also introduced a new Lexicon module type.
There is a new Pericope feature which places section headings throughout the Bible. This feature can be turned on/off by selecting "Options, Display Pericope" from the e-Sword menu.
The Copy Verses feature has been expanded with an option to include the Lexicon definition for Strong's numbers in any Bible with them.
There is a new Morphology popup tooltip for any Bibles that include these grammatical parts of speech codes.
The new Reference Book modules now adapt to the user-defined font settings as the other module types do.