I don't have ad blocker on my Firefox Browser but it comes with the Delphi Extra Member .  I don't know how to turn it off for testing purposes.  At the bottom of a page.

Account Controls for camper6 (DelphiExtra Member)

    Block Ads
    Staff Badge
    Attachments

    Full-text Notifications
    Personal Signature
    My Subscriptions

    Personal Icon

Your membership no ads wouldn't affect popup problems caused by a popup blocker.  Doesn't look like that is the problem here in any case.

I read here about someone else who claimed it 'took forever' to send a message. Perhaps I can try again and let it go longer and see what happens.