jQuery UI problems since 3.5.1

WordPress 3.5.1 landed about 3 weeks ago, since then I have had several emails, direct messages and contact requests for fixing different site-related issues, such as: I cannot drag widgets on my Widgets page My TinyMCE is not displaying on the Posts page My theme/plugin dialogs are broken My X functionality (say slider) behaves in a weird way And so on. Usually, using a smart browser (such as Chrome or Firefox) you are able to open the JavaScript console and get a warning related to JavaScript - either a jquery-ui related file, or tinymce.php related one, or js.php and something… Continue Reading