I have a custom menu with more than 100 items in wordpress .
the issue is that when i select theme location and save it theme location automatically gets unchecked.
it seems to be restricted from Server configurations . i have tweeked max_input_vars to 8000 but no luck .
i am still unable to save the menu.
if i remove one item from the menu it works fine.
any one had this issue before or know the solution?
do you have suhosin installed on your server? If that is the case that you should alter
suhosin.post.max_vars
suhosin.request.max_vars
directives in php.ini
Here is a great article on this topic by Uber Menu plugin developer:
http://sevenspark.com/wordpress/menu-item-limit