When a module specifies “Never” or “Always” for HTML in Chat (Global Option), the user-preference for this option does not show on the Chat Windows Preferences tab.
However, the default setting for the Global Option is “User-Preference” and, in this case, the Chat Windows Preferences tab provides a setting option in duplicate (top and bottom of the preference tab).
I believe that the duplicated options should both be removed from the Chat Windows Preferences tab and the module default should be “Never”.
Mark