I recently upgraded to Moodle 3.1 and now the textarea fields in my dataform activities have all defaulted to "Moodle auto-format". If I try to change it to HTML format, the change doesn't stick (i.e. when I go back to edit it, it still is in Moodle auto format).
I can edit entries without an issue and the changes stick, just not the text editor format. I tried editing other elements of my site (labels, assignments, etc) and the atto editor opens normally. I even tried to create a new entry in the dataform, but the textarea always resets back to moodle-auto format.