The filter editor on Special:AbuseFilter uses, e.g., <form action="http://www.shoutwiki.com/wiki/Special:AbuseFilter/15" method="post" id="mw-abusefilter-editing-form"> (for filter 15). It's broken as http. It works as https. There might be other forms scattered around that need to be updated, too.
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It's built off $wgServer - which we updated for all wikis. However, it seems not Hub, as Hub's settings file was handwritten and has a non-standard indentation, so the find/replace didn't catch it.