This morning I noticed an interesting new variation on the split account problem. As you can see from the screenshot the registration date of the profile is late 2009. That is becuase it is from the account http://forums.adobe.com/people/Jochem%20van%20Dieten-QHlmGd Yet the moderation and private messages counts you see are from the account http://forums.adobe.com/people/Jochem%20van%20Dieten and clicking on the moderation queue link brought me back to the same page. So it looks like I am logged in as 2 accounts simultaneously.
Additionally reply by email bounced at the same time.
Everything is sorted out now (I have built a backdoor into my account so I can log in to it without going through my Adobe ID), but this might be helpful to somebody who is working on the problem.