IOT and Upgrade

IOTs created when the DB is lesser than 9.2 compatible and then later upgraded to 10g and above, they become corrupt. We noticed this problem in a different area; in Advanced Queues.
Queue tables by default have some underlying attached to them.

Oracle documents them as
AQ$_"queue_table"_I (the dequeue IOT)
AQ$_"queue_table"_T (the time-management IOT)
AQ$_"queue_table"_S (the subscriber table)
AQ$_"queue_table"_H (the history IOT)

After an upgrade we noticed that the queues just would not function until they were dropped and recreated.
This seemed a little ruthless so we then exported the queue tables along with these IOTS.
Then dropped the queues and tables in the upgraded system and imported them.
Easy fix :)