I'm in the middle of this hellish process right now. Had a demo of Maserati GRP which I liked and bought (on sale of course) and have since registered the serial, run the Waves Central install&activate process and scanned in Sonar. No go. Running a rescan of existing right now... hopefully that will work. If not, I guess I'll try the full uninstall and reinstall. Not my favorite thing. At all.
Why should it be this difficult? I like some of their stuff but this is giving me hives. Have to remember this next time they make something seem like a no-brainer. Mental note: it's a brainer. I have to add the cost of lost work time wrestling with the arcane and punitive license and install BS. Argh.
EDIT: Well, the full uninstall and reinstall seems to have done the trick. However, I will still be a bit warier of them in future. Annoying. Still, they do make some nice-sounding stuff...