What steps will reproduce the problem? 1. Install Dexterity, create content type and instance of said content type. 2. Disable portlets from left and right columns, such that only the fallback link viewlet (aka plone.manage_portlets_fallback) should be displayed. 3. View the content item and observe the viewlet is missing.

What is the expected output? What do you see instead?

The viewlet should be present; nothing is visible as the viewlet is only registered for AT content types (for interface Products.ATContentTypes.interface.IATContentType).

What version of the product are you using? On what operating system?

Plone 4.1rc2, Dexterity 1.0 KGS

Please provide any additional information below.

Looks like this is present in the current plone.app.layout trunk @ https://svn.plone.org/svn/plone/plone.app.layout/trunk/plone/app/layout/viewlets/configure.zcml

Fixed in r50969 and r50970; should make it into the next Plone 4.0 and 4.1 releases.