Sorry, txt in English :
Hello, by chance I just read your message.
I had the same problem.
They have changed their shortcode.
I have been using it as is for 2 years.
They added an “s” to “items_per_page” (previously “item_per_page”) !
The problem for me was that I was using it on a lot of pages.
I had to use an extension to apply this change to the database …
Hope this will help you,
regards,
J-Michel