make sure that you using current version ;) and if update to one of the 3.2.2 CRs not helps open a ticket with war sample in our jira please.
I've tried that now (using version 3.2.2.CR2 and earlier) and the problem is there still.
Any suggestions to what I might try except from writing a small isolated testcase ?
I had to implement interface javax.faces.component.StateHolder in the converter to make the converter work with Ajax operations.
Small correction: that is necessary not for Ajax only but for common server submits also.