Hi there,
I am getting an issue on a staging site:
The preview could not load due to the iframe response being incomplete. This is most often related to a plugin conflict, or customizations introducing a PHP error.
I have already done the following:
- Ensure you are fully up to date. See our changelog.
- Clear all caches including browser cache then deactivate your caching plugins and other optimization plugins.
- If you’re using a CDN, please clear the CDN’s cache and disable optimization services.
- Test for a plugin conflict. You can do this by deactivating all third party plugins, and seeing if the problem remains. If it’s fixed, you’ll know a plugin caused the problem, and you can narrow down which one by reactivating them one at a time.
- Remove custom CSS, Javascript and templates.
- Reset your htaccess file by renaming it to .htaccess-bak . Then in WP Admin Menu, go to Settings > Permalinks and just click the Save Changes button.
- Contact your host to increase your allocated memory or do it yourself by adding this code in your
wp-config.php
It looks to be an issue with a trailing ‘/’ in the URLs.
All plugins are currently disabled…