Double opt-in confirmation message has no content
The confirmation emails are coming through but the message is empty. No content at all. I've just upgraded to the latest version to see if that fixed it, but it didn't.
This seemed to happen after I set up a custom subscribe success page, but it could be a coincidence.
I've just tried test sending a new campaign, and that works.
I have other brands and lists all working correctly. I'm at a loss.