Can’t display main client galleries

Hey!

I’ve been using Sunshine Photo cart for several years and I’m very happy with it. This error happened during a recent update (I believe). What has happened is:

When I visit the main client gallery page, I see the page but instead of the content just the text “Sorry, this page does not exist”. The Sunshine menu is displayed over it.

In the admin menu, all the Sunshine pages are now listed after each other, before I think some of them were hidden (like galleries, products, orders).

Any idea what I can do to fix it?