The attached page demonstrates that if an actionlink that causes a zone refresh via AJAX is part of the refreshed zone itself, it only works on alternate clicks in IE6.
Each time the link is rendered as part of the zone update it causes a full page refresh when clicked, which means it can do a zone update the following click. It works fine in Firefox though. (Josh Canfield reports it works okay in IE7)
Additionally, if I return a block instead of a zone the second click in the link inside causes the ComponentEventException shown below, instead of the full page refresh.
org.apache.tapestry.runtime.ComponentEventException - A component event handler method returned the value org.apache.tapestry.internal.structure.BlockImpl@d26103. Return type org.apache.tapestry.internal.structure.BlockImpl can not be handled.
Configured return types are java.lang.Class, java.lang.String, java.net.URL, org.apache.tapestry.Link, org.apache.tapestry.StreamResponse,