Hi Robin,
Sorry to hear of the problem you are having.
I have tested it on my test site and found it’s working fine.
Can you please try enabling WP_DEBUG mode? To do this, just go to wp-config.php include this:
define('WP_DEBUG',true);
You might already have a line for WP_DEBUG, so just make sure it’s set to true.
For information on this, checkout this wpmu.org article.
Let me know what errors if any you are getting when you face this issue so that i can troubleshoot it.
This can be due to plugin/theme conflict on your site.
You can just try on your development site using default WordPress theme like Twenty Fifteen and deactivating all other plugins as displayed in the following flowchart to know which theme/plugin is conflicting if any.
http://premium.wpmudev.org/wp-content/uploads/2013/12/Support-Process-Support-Process.png
Kind Regards,
Vinod Dalvi
