Well, I understand that. But it is not getting me closer to a solution.
I have noticed another anomaly. When I use the cachemanager it shows image sizes for a theme I have not used for several years, (and is not in the theme folder) but it refuses to show images sizes for a new theme which I have added and subtracted numerous times (trying to trigger its appearance).
That is why I asked where the cachemanger database for image sizes is, bc it clearly is not updating.