I’m having same problem.
Funny thing is that any forms I created prior to the update all seem to be working fine. It’s only any forms that I created after the update that I seem to be having this problem.
So that should mean there is nothing wrong on the server end, and nothing wrong with the form itself since I basically used the same format.
That would seem to indicate there is something wrong on the CF7 code with any new forms, but still mystery as to what?????