Well, at least it's working, now.
The only thing that is not working still, are the WPML translations. Everything in the data of the MB Block is not showing up in the translation editor of WPML. This used to work fine.
Would be great if the WPML issue would be addressed. It has not been working properly for quite some time now, and some of my client websites are having issues.
It's been over a month now...