I have found when I click on the unpublish tick box in the custom field screen it results in an error (404 Task [pngunpublish] not found.). If I go into the custom field and unpublish from there it works. However, changes inside the Custom Field don't show up when you go back to the main Custom Field screen
Last edit: 1 week 1 day ago by Paul Heinrichs. Reason: updated information
Are you using latest version of Payment Form? I just tried on latest version and could not see the error, so maybe you are not using latest version?
You can submit a support ticket sending us super admin account of your site so that I can check to see what's wrong and get it corrected for you. However, you should update to latest version of Payment Form and check it again first