Thank you, Paul, for all this FREE advice. But it still costs the price of an Agency Plan subscription... I think that for this price, we are entitled to receive some advice without having to put up with rude insinuations...
I can confirm that I have not kept a copy of all your plugin updates for several years! I thought I could rely on my provider's expertise for that.
Whether I want to restore a backup or not is my business, thank you.
In this case, downgrading to version 2.2.1 does not solve the problem. So I'll have to investigate a little further...
Thanks for helping.