[Product-Developers] Product installed but not listed as "installed" - remains in the "installable" list for portal_quickinstaller

[David Bain]

What would cause a product to install but not be listed as installed?

I've created a product which, when installing, it installs successfully but
remains in the the "installable" list for quickinstaller. This happens when
installing the product under Plone 3.0.
Plone 2.5.x behaves as expected.
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