Just to keep all informed:
We've gotten a response back regarding one of two inquiries: 'We noticed that with PM's only the person in the "TO" field gets a copy of the actual 'cc list of names'.
This has now been confirmed as a bug
in the new version of IPB 2.1.5 that was uploaded in March. They have the fix in place for when they do their next release v2.2. I will keep all posted when that is scheduled to happen.
I need to re-inquire about the other message, re: Content of PM in the emails as I haven't gotten a response to that one yet.
Keep letting Peter or I know if you find more things.