The problem was with some of the recent changes, the ACKs were being batched per ACKBatchSize on the client, never releasing the queue what caused the messages to hang on paging. And BTW: Is the semantic on (boolean xa, boolean autoCommitSends, boolean autoCommitAcks) correct? I expected autoCommitACKs=true => not batching ACKs? I've tried using it and I had actually to force a commit call. Clebert View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4188881#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...