Not sure about previous WP versions or other IE versions, but the plugin breaks the Edit Post / Add New Post page when using IE8. The layout is skewed and more importantly, the db does not update on save/publish. Disabling 'Tab Groups' in screen options doesn't have nay effect. However, changing screen options to 1 column does resolve the issue. I do not experience the problem in FF or Chrome. Is anyone else experiencing this problem?