TheThe Tabs and Accordions no longer works with WP 3.5.1 - one of its broken manifestations is to hide Elegant Themes menus. It is also no longer available for installation.
The way it just broke and disappeared is disheartening - no communication from the developer, apparently no potential for a fix going forward.
It brings into question all of the other "TheThe" plugins - not sure I want to base my development on a platform that may just go away or break without any communication. Not very professional.