My Shop is called via a menu VirtueMart Category Layout. But Helix expects a SP Page, but there is no such a page. That is why the layout of the page is not found.
Hi. If it had a relation to the menu item, you would receive 404 page. So you are mistaken.
Just make a reselection associate menu items in the template settings and save it. Read my post above.
This is not a bug. Just new features appeared, about which the database of your site knows nothing. Therefore, you just need to make reselection, clean the cache and save.
Hope your template is Helix Ultimate Free. Because premium templates based on Helix Ultimate are not ready to update.