Hi,
Thanks for contacting us about this! Browsing the website currently I can thankfully see that I am being served cached versions of the page but based on the description the preloader might not be working properly.
Can you let me know which version of WP-Optimize is currently installed on the site?
Thread Starter
Heather
(@ukheather)
The latest version WP-Optimize 4.5.5 (I always have the latest version as I keep plugins up to date)
It constantly shows Current cache size: 0 bytes Number of files: 0.
Even when I do the preload, it shows that it has completed successfully, but the cache says otherwise.
Just clicked preload again and it says “Last preload finished at 11:57 AM, 21 June 2026” and I watched it complete, but it still shows 0 files cached.
It was working fine for many months, but now isn’t and I can’t understand why as nothing at all has changed.
Hi,
Thanks so much for confirming the version I just had to double check. One thing we’re going to need to try is to enable the WP Debug mode and Debug Log and take a look at the contents after the preloader runs.
If you can edit your wp-config.php file to add these three lines just above the line that says “/* That’s all, stop editing! Happy publishing. */”:
define( 'WP_DEBUG', true );
define( 'WP_DEBUG_LOG', true);
define( 'WP_DEBUG_DISPLAY', false);
Once those lines are added and the file is saved, if you can run the preloader and wait for it to complete this should populate a file called debug.log inside the wp-content folder. Once the preloader has finished you can remove the lines added to wp-config.php and then send me the contents of the log using a site such as https://pastebin.com/. I don’t recommend trying to paste the log contents directly in the forum post since there will be a lot of lines.
Hopefully the debug log will provide us some hints as to what the issue is!
