@nsinelnikov Yes, I am using the global settings from your screenshots as default. But today I already tried to disable and enable it and this did not work, when I remember right. I had to enable it for a brief moment in the custom settings for the specific form. The global setting was enabled all the time.
I don’t really know the code, but from my logical standpoint, because of the security issues, now there maybe is a list with post parameters UM accepts and for some reason without this workaround it was not in this list and did not accept it.
“2.6.7 introduces whitelisting for metakeys which we store while sending forms. 2.6.7 also separates form settings data and submitted data and operates them in 2 different variables”