Hi again Jerry, I am finally getting some time to look into this and I have a couple of questions.
If we have multiple lists and our subscribers may be members of more than one list it appears that simply flushing the jos_acajoom_subscribers table is not going to work. I think that it will be necessary to figure out which subscribers will be deleted and remove ONLY those from the subscription table and from the queue, THEN any new subscribers can be added to the subscription table and into the queue for the appropriate list.
Does that sound like what I need to do?
Many thanks,
Sid.