Hi There @mitchdong
Thanks for writing in! I'm sorry to hear that you're having this issue. First of all, make sure that you have installed the latest version of X theme and Cornerstone plugin by checking the latest version numbers from here (https://theme.co/changelog/). You need to update, if you're using an older versions by following our guide here (https://theme.co/apex/forum/t/setup-updating-your-themes-and-plugins/62). Also make sure that you're using the latest version of WordPress as well.
If you're fully updated, then you need to check your server configurations. Make sure that you're running PHP v5.6.x or later to avoid any incompatibility issues. Also make sure that you have enabled PHP cURL extension on your server.
If you're still having issues, setup a child theme and activate it by following our guide here (https://theme.co/apex/forum/t/setup-how-to-setup-child-themes/57), then add the following code into your child theme's functions.php file and then try to re-generate your demo content and see if that helps.
//adjustments to wp-includes/http.php timeout values to workaround slow server responses
add_filter('http_request_args', 'bal_http_request_args', 100, 1);
function bal_http_request_args($r) //called on line 237
$r['timeout'] = 15;
add_action('http_api_curl', 'bal_http_api_curl', 100, 1);
function bal_http_api_curl($handle) //called on line 1315
curl_setopt( $handle, CURLOPT_CONNECTTIMEOUT, 15 );
curl_setopt( $handle, CURLOPT_TIMEOUT, 15 );
If none of the above solutions worked, please provide us with your WordPress login credentials in a secure note to investigate your issue further.