The WACL should *always* be used as jsf-facelets.jar is in WEB-INF/lib. We don't think its facelets that is the problem, but probably JBoss AS. Anyway, I now have a reasonably simple working testcase of this going wrong (I just need to tidy it up a bit and make it easier to run) - hopefully i'll get there tonight with that. Then we'll get some AS guys involved to try and sort out what is going wrong. I'll post a link to JIRA once I put an issue in here :) View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4022421#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...