[imp] Default theme - reverting to standard despite my efforts to override.

[Chris Hastie]

Having just done a CVS update for the first time for 6 weeks or so I'm 
finding I can't get the login screen to use the theme I want as a 
default.

In prefs.php I have this:

// color theme
$_prefs['theme'] = array(
     'value' => 'mozilla',
     'locked' => false,
     'shared' => true,
     'type' => 'enum',
     'enum' => array(''           => sprintf(_("%s Standard"), 
$GLOBALS['registry']->getParam('name')),
                     'barbie'     => _("Barbie"),
                     'brown'      => _("Brown"),
                     'burntorange'=> _("Burnt Orange"),
                     'camouflage' => _("Camouflage"),
                     'cherry'     => _("Cherry"),
                     'green'      => _("Green"),
                     'grey'       => _("Grey"),
                     'lightblue'  => _("Light Blue"),
                     'mozilla'    => _("Mozilla"),
                     'NeXTgrey'   => _("NeXT"),
                     'orange'     => _("Orange"),
                     'sun'        => _("Sun")),
     'desc' => _("Select your color scheme."));

but my login screen is using the standard theme. Prior to the update it 
used the mozilla theme. Have I missed something obvious here?
-- 
Chris Hastie