I am running version 3.5 of "Core" http://themes.themegoods.com/?theme=Core
Only 3 plugins - Current versions of SmugMug Embed, All-In-One SEO, and Jetpack.
There are two areas that malfunction on current versions of Firefox, Safari, and Chrome.
1. On the widget screen I cannot drag widgets or drop down any boxes. I had to turn on accessibility mode. Fail!
2. The toggle from "Text" to "Visual" editors will not function while trying to edit pages.
Things I have tried.
Deactivated all Plugins
Deleting Plugins and Re-Install.