There is what turns out to be a critical component with an id of DeltaSPWebPartManager, which lives in most Master Pages. The problem is - where exactly should it go?
In the Microsoft-made master pages, seattle and Oslo, this component is in the
<body>. But in the minimal master page created by the Design Manager, it's in the
If what you're putting on a page is a Nintex Form, it's a make-or-break difference: when DeltaSPWebPartManager is in the
<body> of the underlying master page, it all works. When it's in the
<head>, it fails rather miserably.
Why do I need to know? Because there's a definite bug in either the Nintex Form rendered or the master page. Either way, it needs to be found and fixed, and that can't be done until we can prove conclusively who owns the problem.
If you know where this component should go, please let me know.
The relevant markup looks like this:
<!--MS:<SharePoint:AjaxDelta id="DeltaSPWebPartManager" runat="server">--> <!--MS:<WebPartPages:SPWebPartManager runat="server">--> <!--ME:</WebPartPages:SPWebPartManager>--> <!--ME:</SharePoint:AjaxDelta>-->