NZBxxx support still seems to be broken in 1.6, although it comes much closer to working. Now it passes a URL successfully, but the URL that gets sent is "http://nzbxxx.com/api-nzb-download.php?id=[******]&nozip=1&apikey=undefined&username=undefined" except the NZB ID is correct, I've blanked it for privacy reasons. I have set my NZBxxx username and API key in the SABConnect settings, but it doesn't seem to take. I've tried re-installing, uninstalling, disabling and re-enabling, resetting Safari and trying a different machine. Seems like something about how the username & API key are being fed to NZBxxx is broken, hence the "undefined".
I am happy to see the green "sent successfully" icon has returned on sites that work though, I could be wrong but I think that's new to 1.6. It's ultimately cosmetic but it's still nice to have, feels more complete.