If you have troubles since the update to WordPress 4.5 please read this post before opening a new thread.
I get the following error when trying to add Post/page content element on a template.
All the other elements work fine.
Couldn’t add the element because the server didn’t respond.
Please wait a few seconds, then try again
Are you working on the local server? Or live? Maybe just a slow connection.
If you have a lot of templates or your blog is quite big you might find you need to up the php allocation of your server, otherwise you can get errors when saving new templates. There are threads about this on this forum.
Be careful with WPML also. I have had problems updating templates when using this plugin. I usually turn it off before making any changes or you can lose everything.
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