The fault with eduBuzz sign-up has now been fixed and tested.
For the curious: the fault was being caused by an incorrectly configured plugin, danalog’s site-wide tagging solution, which we’ve been experimenting with. This plugin doesn’t read the domain name automatically, but requires it to be coded into the plugin. And until you do that, it has a placeholder in there of – you guessed it – “domain.tld”.
The big question is how well does the sitewide tagging work?