Ted,
Changing network setups definitely changed the toontrack computer ID. I agree this is a pia - but to workaround, you could reinstall your phone/modem drivers - and go reathorise all your Toontrack products. It's easy enough with your "online" connection - and you only have to do it once. If you have a lot of Toontrack products - just do th emain ones (like Superior) and you can do the rest as you use them.
The main thing is that you know what the issue is now - and that there is a workaround, and your Superior will always work. ;-)
If your concerned about using too many authorisations, you can just leave the phone/modem driver installed and delete the old authorisations (for the old computer ID). If you ever *do* run out of authorisations - Toontrack is really good at resetting them. Just make sure you're signed up on the Toontrack forums - so you don't have to mess around later ;-)
hth