I came across a strange instance of this. Developing on localhost (https://local.dev) on WAMP with a multisite install, activated the plugin per site. It still brought up only the title option and then errored out on any post edit/settings page with this:
PHP Fatal error: Uncaught exception 'GuzzleHttp\Ring\Exception\RingException' with message 'cURL error 60: SSL certificate problem: self signed certificate in certificate chain' in C:\wamp\www\wordpress\wp-content\plugins\constant-contact-forms\vendor\constantcontact\guzzlehttp\ringphp\src\Client\CurlFactory.php:127
I tried the same install on a live single site install using the same theme/plugins and it worked fine. Neither localhost nor the live site had SSL set up at the time. The single site install, however, did not throw a single error and brought up all of the editor fields. I set up a self-signed cert for localhost (https://local.dev, which makes Chrome have a fit) and it suddenly works fine even with a multisite install.
Just weird…
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This reply was modified 7 years, 10 months ago by kinna28.