Queueing :: Propagation Not Working - Only After Reboot?

I migrated an AQ solution which sends messages between three instances from a development environment to an UAT environment and my propogation from one instance to another is not working as per development.

When I enqueue a message I note that the enq_time is one hour behind the actual sysdate.

All the messages are been stored in the queue table and are propogated through only when the instance is restarted.

FYI - the datbase is 11i Express.

The progration job is:

dbms_aqadm.schedule_propagation(queue_name => 'ITEMS',
destination => 'DIBS_MSG_DIBS_EXT'
,start_time => sysdate
,next_time => 'sysdate + 100/86400'
,duration => 60
,latency => 3000
,destination_queue => 'DIBS_STREAMS.ITEMS');