Dear toyotadesigner,
thank you for your instructions, although they haven't given the results we wished.
Under System Preferences/Security and Privacy/Privacy, the setting for Files and Folders, I only have the option to check "Documents" and "Desktop". The setting for Screen Recording was off, but is now on, and I have downloaded the current svn. And rebooted. But no luck, I still can't use the mouse in the color dropdown menu. (And if you know how i can select with the keyboard, that could also be useful). Any other ideas?
Thanks in advance.