WP 3.1 and Enqueueing jQuery
Theme developers, take note: Mark Jaquith gives some useful information regarding core jQuery updates in WordPress 3.1:
WordPress 3.1 uses jQuery 1.4.4, and jQuery UI 1.8.6. You should check your plugins to see if anything broke.If you were enqueueing
jquery-ui-coreand using the “widget factory,” or something that depends on the widget factory you will have to update your plugin to enqueue
jquery-ui-widgetinstead. In jQuery UI 1.8.x, the widget factory was separated from jQuery UI core. Please examine
wp-includes/script-loader.phpto see the entire dependency tree.
If these changes affect your Theme, please update accordingly.