[Plugin: Multi-level Navigation Plugin] Settings do not save and it doesn't seem to obey settin

I solved adding in admin_page.php

line 78

// 20130626 abertranb added to save superfish_arrows and secondmenu
			'superfish_arrows'         => '' ,
			'secondmenu'         => '' ,
// end

line 420

// 20130626 abertranb added to save superfish_arrows and secondmenu
			'superfish_arrows',
			'secondmenu',
// end

and solve this issue