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I’m getting the error when using the drop down sub menu.

(Warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, ‘TheCartPress::loop_start’ was given in /home/qua47297/public_html/wp-includes/plugin.php on line 486

Definitely a bug in your code somewhere, it’s not an external hack, looks like it could be in the shopping cart plugin or maybe the call to it from the menu.

Back to whoever built the site I think, maybe it’s an obvious one for one of the WordPress guru’s here.