It has been some time since David and I took over Essential from Julian and this thread is getting very large and unmanageable. Therefore please DO NOT post here but instead either make a new post or attach your post to an existing thread that is relevant.
In addition the M2.5 version of Essential will NOT be developed any more. The latest release - https://moodle.org/plugins/pluginversion.php?id=6814 - will be the last (unless a museum needs to make some tweaks for a historical Windows XP display).
Essential Developer and Moderator.