New zen subtheme install errors out with "Undefined index" and "Trying to get property of non-object" errors ?

Hi!

I'm on Drupal 7.22 & doing my 1st Zen subtheme install. Up til now I was just using the standard Bartik theme.

I follow the simple instructions to create a subtheme with drush command. It gets created but when I visit the site I get all this in my log -

May  5 19:00:57 ixyDESK DRUPAL: https://ixydesk.loc|1367805657|php|2001:xxx:xxxx:xxx::10|https://ixydesk.loc/||0||Notice: Undefined index: ixy-zen in drupal_theme_initialize() (line 100 of /home/ixy/web/drupal/includes/theme.inc).
May  5 19:00:57 ixyDESK DRUPAL: https://ixydesk.loc|1367805657|php|2001:xxx:xxxx:xxx::10|https://ixydesk.loc/||0||Notice: Trying to get property of non-object in _drupal_theme_initialize() (line 146 of /home/ixy/web/drupal/includes/theme.inc).
May  5 19:00:57 ixyDESK DRUPAL: https://ixydesk.loc|1367805657|php|2001:xxx:xxxx:xxx::10|https://ixydesk.loc/||0||Notice: Trying to get property of non-object in _theme_load_registry() (line 335 of /home/ixy/web/drupal/includes/theme.inc).
May  5 19:00:57 ixyDESK DRUPAL: https://ixydesk.loc|1367805657|php|2001:xxx:xxxx:xxx::10|https://ixydesk.loc/||0||Notice: Undefined index: ixy-zen in theme_get_setting() (line 1419 of /home/ixy/web/drupal/includes/theme.inc).
May  5 19:00:57 ixyDESK DRUPAL: https://ixydesk.loc|1367805657|php|2001:xxx:xxxx:xxx::10|https://ixydesk.loc/||0||Notice: Trying to get property of non-object in theme_get_setting() (line 1456 of /home/ixy/web/drupal/includes/theme.inc).

Ive been digging around but have no idea what I'm doing wrong :-(

Any help somebody can give?

--ixy