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@riccardo-rossini glad it’s all working now for you 🙂
Marking this topic as resolved.

@riccardo-rossini WP 4.0 introduced the new Media Library Grid, among others. Any plugin that adds features to the media library may need serious work per https://make.wordpress.org/support/2014/08/omg-wtf-bbq-post/ So at this point, I suggest that you follow up with the rtmedia plugin authors about your issue.