I have used the migration option and all appears to have worked but when I go to edit the custom fields the fields flash on for a second and then disappear.
Please update Meta Box, MB extensions to the latest version, then deactivate all other plugins, switch to a standard theme of WordPress and migrate the field group again.
If it does not help, can you please share some screenshots of the issue and export the field group to a JSON file and share it here? I will take a look.
I got the issue. There is a field type acfe_post_statuses which comes from a third-party plugin, not a native field type of ACF so there is no corresponding field type in Meta Box to display that field and it breaks the field group.
I remove this field type from the JSON file and import the field group to my local site and it works correctly.
That is great many thanks Peter, would I be better off removing this field before I migrate? I still have a copy as the site is still live using ACF as I'm just starting a rebuild.