Missing FILTERS from Hikashop admin menu

As of today the Components, Hikashop, Display, Filters menu is GONE.

We added a filter to the display of our products, and that is working fine, but when we return to the same menu item this one (Filtes) is gone.
Tried to start the menu-item directly (/administrator/index.php?option=com_hikashop&ctrl=filter) and this will get us to the right menu.

How can I restore this menu-item ?

The hikashop, configuration, access level, FILTERS is OK (set to all).
Nothing change there since yesterday.

Can you help ?
Where are the menu items stored in the database ?

just send me an email or pm so i can sent you the details....

Just find out that when i switch from dutch to english on the admin language the FILTERS menu option IS available..... and disappears again when I switch back to dutch !!!

What I did was setting FILTERS=" " in my dutch language file of hikashop and therefore the option Filters disappeared from Hikashop, Configuration, Display menu. When restoring the language file ...actually deleted the FILTERS=" " option in the personalised language section the option also appeared when the ducth language is active.

Thanks for helping.