Hi Torben,
The two main reasons, why xinha does not show up are:
- the config parameter UseHtmlAreaForRichtextP is set by default to 0 (you seem to have changed this for your sites).
- modified master templates (the ones from cvs head are a moving target, the ones for released versions are usually fine).
There is no dependency between xowiki.css and xinha (xinha works with and without xowiki). xinha does not load xowiki.css by default (it could not do so e.g. in a forum, and it does not in an xowiki instance). The xowiki instance at openacs.org/xowiki was configured to use the xinha plugin stylist and to load for this plugin the mentioned .css files. Since xowiki can be used for various purposes (weblog, news, faq, slides, ...) enforcing the load of stylist and a single xowiki.css is not recommended.
Since seem to have quite recent versions, my recommendation would be to use the OpenACS 5.5.1 release (with its master templates) which was released on Sept 13 2009...
