Marc, I concur with xtom.

The code is failing around the close.png and some WOW slider action involving jQuery.
I would clone the menu and place it off-page.
Then select the original menu and delete and accept delete all copies.
If you still have some page9s) with a menu, that is the problem so delete those as well.
Finally place the clone back in position an Repeat on all pages for that.

Acorn