Registered plsql callback not notified

Question

Oracle Database 10g Enterprise Edition Release 10.2.0.3.0
Production system: Two-instance RAC
Testing system: Single instance
I have a PL/SQL procedure registered through DBMS_AQ.REGISTER to be notified when messages come in on a particular queue. While it works in test, it is never called in production.
I have checked that the messages are enqueued correctly. There are no messages in the associated exception queue. There do not seem to be any trace files associated with this failed notification.
There are messages in the exception queue for AQ_SRVNTFN_TABLE. The USER_DATA for these messages seems to be the procedure which I registered.
What can I do next?

Answer 1

Looks like we found it...
This is TEST:
create or replace
TYPE     aq$_descriptor AS OBJECT (
        queue_name       VARCHAR2(65),                -- name of the queue
        consumer_name    VARCHAR2(30),                -- name of the consumer
        msg_id           RAW(16),                     -- message identifier
        msg_prop         msg_prop_t,                  -- message properties
        gen_desc         sys.aq$_ntfn_descriptor)     -- generic descriptorThis is PROD:
create or replace TYPE     aq$_descriptor AS OBJECT (
        queue_name       VARCHAR2(30),                -- name of the queue
        consumer_name    VARCHAR2(30),                -- name of the consumer
        msg_id           RAW(16),                     -- message identifier
        msg_prop         msg_prop_t)                  -- message properties
ALTER TYPE     aq$_descriptor
  ADD ATTRIBUTE(gen_desc sys.aq$_ntfn_descriptor)
  CASCADEIn c1001000.sql, aq$_srvntfn_message.queue_name is upped to 65 chars, but aq$_descriptor is left alone.