Trying to alter some custom fields and when I try to save the fields I get an error saying "Please match the format requested" on a section I haven't altered at all - checkbox filed I belive.
Any idea how I solve this as I have to make major ganges to this complex set of fields for a frontend submission form.
Can you check the radio subfield ID? It should have the format: Use only numbers, letters, and underscores (and rarely dashes). Following the documentation https://docs.metabox.io/field-settings/
If it still doesn't work, please share some screenshots of the field settings in the builder. I will help you check the issue with the field.
Actually - just figured it out - but have q question - this is an old form and I have had to alter some of the field names - will that affect the old posts that have already been filled out?