It took about a week, but I finally got the problem resolved. I thought I'd pass along the details, should anyone else have a similiar problem.

For whatever reason, there was a duplicate account on their server that had my user name, password, and all other correct personal info ; but it was tied to a different choice privileges account number.

There was only one entry in this duplicate account, a reservation from 2005 that had been canceled. I had never seen or heard of this other choice privileges account number, and have no idea where it came from.

The customer service agent had me on a conference call with an IT specialist and neither one can figure out how it happened. Very strange.

But I was impressed with their service, and how they tracked down this duplicate account number. It was excellent service on a difficult technical problem.