Hi Laca,
Thanks for you reply. It helped me to review all my plugins and I finally found a faulty plugin – called “Prevent Browser Cacher” (obsolete, by the way) – which was preventing the display of the Instagram posts. I disabled (and removed) it and now it works fine.
Note that your Instagram feed plugin is magnificent. We were using the Smashballoon’s one for the moment, but we’ll clearly consider to switch to yours wich is clearly nicer and more configurable. We don’t regret to have subscribed to the TrustIndex PRO subscription !
Best regards
Pierre