OK, so It's fixed with help from the support@cakewalk.com folks, a nice guy named Kris.
I did a clean reinstall, which necessitated messing with regedit. The link support sent me to for that was here:
https://help.cakewalk.com/hc/en-us/articles/360034066393-Clean-Install-Cakewalk-by-BandLab?source=search&auth_token=eyJhbGciOiJIUzI1NiJ9.eyJhY2NvdW50X2lkIjo3MDk1NzEsInVzZXJfaWQiOjkwMDc5MTYzODM4MywidGlja2V0X2lkIjo0MTQ1NzgsImNoYW5uZWxfaWQiOjYzLCJ0eXBlIjoiU0VBUkNIIiwiZXhwIjoxNjAyNTgyMTg4fQ.ywXRVW5ZIiIcRbrRgrozrEmNCIdyAVNyZoCIbxWOppo
That fixed the issue.