[Zope] Kupu 1.3 under zope2

Can someone please confirm that kupu 1.3 works fine under zope2? I have just installed the 1.3 tarball but I get un error in kupumacros at the following line: <metal:slot define-slot="bootstrap-editor"> After fixing the illegal name the editor get displayed, but my test doc is not editable. If i try to edit it the kupu debug log shows the messages: 11:32:1 - Link tool initialized 11:32:1 - Image tool initialized 11:32:1 - Table tool initialized 11:32:1 - Source edit tool initialized 11:32:10 - Editor not initialized yet! Actually, uUpon inspection of the sources, it appears that the function initialize defined in KupuEditor does not get called at all. Am I missing something obvious? Thanks, __peppo