WordPress 3.1 uses jQuery 1.4.4, and jQu…

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-core and using the “widget factory,” or something that depends on the widget factory you will have to update your plugin to enqueue jquery-ui-widget instead. In jQuery UI 1.8.x, the widget factory was separated from jQuery UI core. Please examine wp-includes/script-loader.php to see the entire dependency tree.

#3-1, #dev-notes