Maximum Menu Width reverts to default value 960

Hi Chris,

I updated to WP 3.6, Version 1.5.2 of your plugin, and the updated TwentyTwelve theme. I am using a child theme with 2012 theme. I have been using the hack shown below because if I set the max menu width in the plugin’s settings, the 600 value will not save, and reverts back to the 960 value. I have had this issue for about a year now and I am wondering if anyone else has discovered why my max menu value might not be saving properly with my WP installation.

Responsive Select Menu Hack
/* @media (max-width: <?php echo $this->settings->op( ‘max-menu-width’ ); ?>px) */

@media (max-width: 600px)
{
.responsiveSelectContainer{
border:none !important;
background:none !important;
box-shadow:none !important;
}
.responsiveSelectContainer ul, ul.responsiveSelectFullMenu{
display: none !important;
}
.responsiveSelectContainer select.responsiveMenuSelect, select.responsiveMenuSelect {
display: inline-block;
width:100%;
}
}

http://wordpress.org/plugins/responsive-select-menu/