Is there already an update?
I fixed the problem for myself.
Go to a contactform.
Add fields with an ID like [your-name] and save.
Scroll back upwards and go to the other tab called ‘E-mail’.
Here you have to replace all your field ID’s you used at the previous tab and save.
Now it has to work. I hope it will fix your problems to. Answer for any other questions.
I have the same problem! Updated everything to be sure nothing was out of date, but it isnt fixed yet!