Submit button disabled in Forms after upgrade to CSM 12

Hi!

After upgrading from 11 to 12 I cannot longer submit Forms if the checkbox "Save form entries" (freely translated from Swedish) is not checked.
If the checkbox is not checked I get an message that says: "The ability to save data for this form has been turned off." and the submit button is disabled.
If I check the box I can submit the form and the message dissapears.

Any ideas what I am missing?

Thanks!

/Kristoffer