Hi,
users of my website confirm what I was thinking. When they watch it, the theme can be the classic one, or another one. But the theme I choose is the Blackbirch that I modified, and that I want people to see.
Can you explain me how to set up my theme properly. In Config, I set the theme "blackbirch", and I choose not to display the "select theme" option on themain page.
My site: http://photosandco.free.fr
Go to coppermine's config and change the cookie name to something else (make sure to only use valid chars, i.e. alphanumericals and no special chars). This will reset all theme selection that you (or anyone else) might have made before. After you have done so, you can even delete the unwanted theme folders from http://photosandco.free.fr/themes/