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Michael, thanks for your feedback. Yes, once Yoast was deactivated, the issue disappeared. However, it has now been fixed by extending the max_execution_time to 1000 in my php.ini file i.e. max_execution_time = 1000;

Marko, in the event it may be one of my plugins or theme causing the issue, I tested on a clean install of WordPress, together with just Yoast and Total Cache. Was still having the same issue. It has got me beat, I am afraid. I have decided to give up and try another route.

However, thank you very much for your terrific support in trying to resolve this.

Marko, thanks for your feedback. Still no joy but making progress, I think. I tested my scheduled server job (wp-cron) to make sure it works, which it does. Set to run every 5 minutes at the moment. Checked the cron events in WP and w3_pgcache_prime runs every 15 minutes and is updated when the cron job is run every 5 minutes. I removed the folder you suggested, above, and when the cron events and cron job were run, it re-created the page_enhanced folder. I run this test for 2 cycles i.e. 2 x 15 minutes, then went to the /page_enhanced/www.webstarter1.co.uk folder. The only page that was cached, was the index page. Also, after the second cycle i.e. when the preload was run for the second time after 15 minutes, I checked the time stamp at the bottom of the source code of the index page and it was still the page that was cached in the first cycle i.e. It had teh same time stamp and I thought it would have moved it on by 15 minutes.

Marko, are you saying: to create a physical sitemap.xml file in the root i.e. public_html/sitemap.xml?

I have already deactivated native wp cron i.e. define(‘DISABLE_WP_CRON’, true); and created a scheduled cron job on the server to run every 15 minutes.

Marko, thanks for your feedback. It seems to have resolved itself. However, I am having an issue with Preload. Checked the settings over and over and there is nothing obvious. Using nearly all default settings with Disk: Enhanced, where appropriate. For testing purposes, I set the preload interval to 900 secs and pages per interval to 100 (site only has less than 10 pages). I used the XML Sitemaps Generator by Auctollo and referenced it in Sitemap URL. Within /sitemap.xml, it includes a sitemap for each of the pages i.e. each time a new page or post is created, it appends a new xml sitemap within sitemap.xml. The Homepage appears to preload but internal pages don’t. To check, i visited the pages, then looked at the source to see the Cache timestamps. The Cache on the internal pages, showed the page was cached when i manually visited it i.e. it did not have an earlier preload stamp.

Would it be possible to point me in the right direction or help in resolving the issue?

Dan, thanks for your response. After resolving the issue last night, I was just about to update post. It was some code left in the Theme’s function.php file.

Yes, I also tested on my mobile devices and Webmail, without any issues.