Although I don't think this is a bug in ajax4jsf maybe someone here has come across the same problem.
I try to use ajax4jsf to rerender a jsf component. The ajax request goes to the server fine, but the response fails to parse because it contais entities like ä etc.
The content type of the ajax response is text/xml;charset=UTF-8 and the xhtml file is written with   åäö, i.e. no entities but for some reason when the facelet is rendered those characters are translated to entities.
How to change that behaviour? I've googled on everything I can think of but no luck.
The application is built with JBoss Seam, now with JSF 1.2 RI (used myfaces before, same issue) and trinidad 1.0.1.
Heureka, I found it. In the web.xml I had copied org.ajax4jsf.FastFilter was used. Changing it to org.ajax4jsf.Filter solved the problem, now it works fine.