Hi there,
the IP restriction should be removed from the url I sent you earlier. Could you please take a look?
Please note that we had to come up with some solution in the meantime, so we deactivated the Post Grid in Essentials Addons for Cornerstone, removed the original Post element and substituted it with the new Post element in the latest theme X version.
Also the problem manifested itself on few other sites using similar setup - e.g. nezzazvoni.cz and slshranice.cz. We have few dozens clients websites built on theme X, so we really need systematic solution - we can’t afford to retroactively update every single site with the new Post element.