I get the following notification on many pages:
Notice: Undefined variable: jump_link_target in include() (line 74 of /Users/peter/dev/eyestreet.com/drupal/sites/default/themes/cti_flex/templates/html.tpl.php).
The CTI Flex author is still working on compatibility with Zen 7.x - 3.x. See http://drupal.org/node/1590214. In the mean time, this hack seems to work:
Duplicate the line starting with settings[zen_jump_link_target] and change it to settings[zen_skip_link_anchor].
In themes/cti_flex/templates/html.tpl.php, replace $jump_link_target with $skip_link_anchor.