If the Taxonomy module is not installed, you cannot load the configuration / settings page for Omega subthemes created with the starterkits. This does not appear to affect the main theme.

The PHP message is:
PHP Fatal error: Call to undefined function taxonomy_vocabulary_get_names() in /themes/omega/omega/theme-settings/layout-config.php on line 142

Enabling the taxonomy module resolves the issue, but it seems like there either shouldn't be an issue with the module being disabled, or a requirement to enable the taxonomy module.

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Trevor J created an issue.