Thanks very much for the heads up. Since I had that panel number thingy made, it's important to me to get 4cs as my permanent number in SCCA. I pre-registered for the year (and they finally cashed my check), but I also registered on-line just to make sure I have that number. We'll see how much confusion that causes them at registration.
I'm glad to see that SCCA is using that pre-registration site, and I'm going to find out why ER doesn't use that excellent service (I'm sure they have their reasons...).