Bluehost enables Varnish HTTP Cache for websites on their shared hosting plans to speed up page loading times. But this may have unintended consequences on site functionality.

Version 5 of the A-Z Directory module adds an option to link the name to a Bootstrap modal with all of the contact information, including Miscellaneous Information and the new custom fields introduced in Joomla 3.7. The display of the modal is determined by your Options within the Contact Component. For example, within the Options, you can set the "Display Format" to "Plain", "Tabs", or "Sliders".

My rule of thumb is to increment my version of the A-Z Directory module whenever I break backwards compatibility. For me, breaking backwards compatibility in Joomla means a change in the default layout of the module that would prevent the proper display of the module if a user is using a template override. This is something I try to avoid at all costs, but sometimes there are bug fixes and features that warrant these kinds of changes.