My menu has gone after updating to Wordpress 4.7!

Please see this screencast and provide a fix. ASAP!
share.viewedit.com/rTJrFWXEwPGrcdAvVvSncV

Dear sir,
Now our theme have not yet had version of wordpress 4.7, we are updating it, we will release update version next week. Please wait.

Thanks.

That is really poor. This should be done in advance. We are making big loss in our business because of this. Sort this out ASAP!

Dear sir,
Update wordpress 4.7 error:
Please go to folder: wp-content/themes/furnicom/lib find in files responsive_dropdown.php and responsive_dropdown_sidebar.php function function Furnicom_MenuRes_Filter , add code:
if( !isset( $args['furnicom_resmenu'] ) ){
return $args;
}
Refer here:
prntscr.com/dh54b9

Thanks.

Sometimes when I refresh my website
Internal Server Eror 505

and sometimes show error
postimg.org/image/mock7ezbb/

Dear sir,
I see your site display normally now, what do I do to see this error?

Thanks