My OS X Address Book started out with about 10 groups, but now iCloud.com has about 300 groups.
The replication arose because of a bug in how iCloud handles a mixture of Address Book Cards with both OS X and Windows line terminated Notes (LF vs. CRLF - it helps if you once used a typewriter).
I figured out how to convert Address Book to all LF terminated line feeds and I was able to get iCloud.com working on a different account, but my core account is stuck with 300 groups (some replicated 50 times).
I know how to delete all Cards/Contacts in iCloud.com Contacts, but, unfortunately that doesn't remove Groups. (Groups have an interesting behavior in iCloud, almost as though Apple has a special plan for them.)
I can delete Groups one at a time on iCloud.com, but that's tedious. Unfortunately deleting them on Address Book, and trusting in sync to clear up iCloud.com, is equally tedious.
Has anyone heard of a way to delete all Groups on iCloud or Address Book 6? Perhaps an AppleScript app?
Alternatively, has anyone heard of Apple resetting a corrupt iCloud account to clear out bad data? (I have a clean version of Address Book I can use to restart -- that, by the way, is harder than you'd think. Again because Groups are special).
Advice appreciated. If I get some free time I might take may laptop by the Genius bar and see what they say...
Tedious and confusing details are here: