Thanks Hiram - It turns out this was NOT an issue with ActiveMQ. It looks like Jencks was the problem - I switched my MDP configuration from Jencks to Spring 2.0 and everything works perfectly.
I have been having a variety of issues with transactions and redeliveries that suddenly disappeared after switching to Spring 2.0 - John -- View this message in context: http://www.nabble.com/4.0-Sync-Errors-t1564749.html#a4287159 Sent from the ActiveMQ - User forum at Nabble.com.
