I've created a new theme, actually a copy of blackcandy.
I've modified the _config.php file to SSViewer::set_theme('newtheme');
And now I can't access the cms backend thru http://localhost/silverstripe/admin command. I can't log in because no form is displayed.
The system automatically redirects to http://localhost/silverstripe/Security/login?BackURL=%2Fsilverstripe%2Fdev%2Fbuild
and displays my new theme as i can find at http://localhost/silverstripe...
I have no control over the cms.
This happens every time I want to create a new theme.
If it's an exact copy of BlackCandy, it should work, at least after a ?flush=all ... Make sure the $Form variable is present in the content area of the Page.ss area, because that is what makes the (login)form appear. Make sure to flush again after you add it (if it's missing).