I have over 1000 names in my address book.

These are split into Groups / Categories.

When I type "Cat" into the "Bcc:" field, up comes a list of those categories, and I choose one, to send the email toall those whose addresses are in that Group.

In the Address Book, when I scroll down the list of names, the different Groups are included in the List.  If I select a Group, it "changes the Page" to show me all the names in that Group.

Yes, I know - you knew that.

BUT... when I click "Save" or "Save to File" or "Send", the Group information has disappeared. 

So SOMEWHERE I suspect there is a "missing Link" file.   If there is such a thing, where would I find it ?  Or something ?