I've read everything I can find on setting a custom favicon, but try as I might, the default Grav favicon continues to be shown.
The theme is a child theme of Quark, and the custom favicon is in:
/user/config/themes/bsr-quark/images/favicon.ico
/user/themes/bsr-quark/images/favicon.ico
So far as I can tell, there is no other favicon.ico file within the site, so I don't know what it is that is being used as favicon.
Is there a solution to this?