[Zope] Missing producst

[Matt Goodall]

Hi,

Some home grown products that I imported into a clean installation of
Zope v2.4.2 have gone missing from the "Add" dropdown.

The products are listed in /Control_Panel/Products and instances of
those products that were also imported work fine. The only problem is
that I cannot create new ones :(

Has anyone seen this behaviour before and does anyone know what I can do
to get them back?

Thanks for your help.

Cheers, Matt