I now have the Layout-Manager working. Wow! What a great piece of work. Really exciting development.
I have set the display to the Layout-Managed-Subsite-Tabbed. Now in its own right this is superb, and I can really see the potential for flexibility of format once you start customising the CSS.
I notice that the XoWiki included index page does not respect the embedded xowiki column defs as it usually does. Is that expected behavior? All my elements on the xowiki index page are left aligned and full width.
Also, I am experimenting with arranging a page with two columns and four includelets, but this seems to be escaping me at the moment. I was expecting to see something like the 'news' and 'latest posts' boxes on the OpenACS.org site.
R.