If you're not using clean urls, you can't delete a setting through the user interface because the "delete" button appears bound to the clean url.

Comments

elfin_john’s picture

elfin_john commented

Changing line 100 of default_filter.module to

from

'<a href="' . $base_url . '/admin/settings/default_filter/delete/' . $row->id . '">' . t('Delete') . '</a>',

to 

l(t('Delete'),'/admin/settings/default_filter/delete/' . $row->id )

seems to resolve this.