[Zope] PageTemplates problem

We've recently installed Zope 2.4.3 on an Apache based SuSE Linux 7.3 server. Everything is working fine except for the PageTemplates product. We've placed the TAL and ZTUtils products in the Python directory (rather than Products) as recommended elsewhere. We've also put the PageTemplates product inside the Products directory, but it never appears as an installed Product when we restart Zope. TAL and ZTUtils appear fine, but no sign of PageTemplates anywhere... Are we missing something obvious here? Any help appreciated!