I got the following email bounce back, when I replied to a post in the Usability forum by email:
The message "RE: Moodle in English: Essential Bug! -- Module page not visible when it includes Empty Folders" could not be authenticated, since it was sent from a different email address than in your user profile. For the message to be authenticated, you need to reply to this message.
I have confirmed with IT that my 'from' address will be the same as the one set in my moodle.org profile - can someone have a look at this please.
If you want a bug submitting, I will do so.