Here is the response I got from the Waves tech:
Dear Charles,
Thank you for contacting Waves Tech Support.
Please note that Sonar Professional is not officially supported with Waves V9.
Our software was not designed for it nor tested and qualified to run with it.
Due to this fact, we do not have a knowledge-base of possible issues.
Please refer to our Supported Hosts page for a comprehensive list. You will find that we support Sonar Platinum.
I can advise on trying out the following:
Please refer to the How to Find Your Plugins in Sonar article on our support page and follow the instructions described.If that did not work, I can advise on rolling back to an earlier version of Waves V9.6 (instead of 9.91). I cannot promise it will work but you can try it out.
Please refer to the How To Roll Back to Waves v9.6 article and follow the instructions listed.