Herman, Gary, and John - you should be all set.
There is what I'd call a bug in PayPal that causes this problem. We mentioned the issue and a workaround several years ago but here's the info again.
Because of the way that PayPal processes these recurring subscriptions to vBulletin, a server upgrade we did some years ago caused the PP system to have a problem. When a subscription is created by a user, at PayPal it's hard-coded to the server and vBulletin system name. Yes, this isn't a good idea but no one at PP or vBulletin seems interested in our opinions on the matter

. So what happens is the recurring payment is processed by PP and then confirmation is sent to the old server - which no longer exists. Consequently your subscription doesn't get updated.
Our treasurer Bob Tippens has to manually check every renewal and catch these that don't update. Sometimes some do slip by for which we apologize.
To get around this problem permanently, you need to cancel/terminate your old subscription and create a new one. This will then correctly reference the setup we've been using for the past 3-4 years.
We are looking at other conferencing/payment/website solutions but because of the many years of data we have, these are pretty substantial undertakings and we aren't quite ready to start that process. We'll let everyone know when we get close.