Marko Vasiljevic

Hello Gary,

Thanks for reaching out, and for choosing W3 Total Cache.
As I’ve mentioned in wp.org https://wordpress.org/support/topic/w3-total-cache-prevents-me-from-logging-into-dashboard/
This suggests that maybe during the updated the mentioned file got corrupted somehow.
I would advise completely removing W3 Total Cache and re-installing:
1. Purge Cache
2. Deactivate and Delete Plugin
3. Check .htaccess File (make a backup)
W3TC will create many directives in the .htaccess file to control the caching behavior. Each section will start and end with comments like “#BEGIN W3TC Page Cache core” and “#END W3TC Page Cache core”.
Ensure that no residual entries are leftover in your .htaccess file after deleting the plugin.
4. Delete wp-content files and folders
– cache folder
– w3tc-config folder
– object-cache.php (if exists)
– advanced-cache.php (if exists)
– dbcache.php (if exists)
– upgrade folder
– delete w3-total-cache folder in wp-content/plugins/ (if exists)
5. Delete Cached Files from CDN (if using CDN)
Besides deleting all the relevant files, if you use CDN then ensure to purge the cached content from your CDN. This is necessary when you enabled minify option in W3TC settings. You should delete the minified and combined scripts and CSS files from your CDN server to avoid the site breaking on the browser.
6. Go to your wp dashboard and re-install W3 Total Cache

Thanks!

Hello Mitchell,

You can check our services within the plugin in Performance>Support.
I recommend a Performance Audit solution for this. If the plugin is removed and you are unable to visit the mentioned page please check out this link.
Thanks!

Hello Maarteen,

Thank you for the information and I am glad you managed to find the source of the issue.
Yes, deferring the scripts is awesome, however, some scripts do not agree with this. The only way to keep deferring and also keep the wheel not constantly spinning is to exclude that specific JS from being minified in Performance>Minify>Advanced>”Never Minify following JS files”
I would suggest reaching out to the support of the CF7 and ask which files is responsible for that and add it to the mentioned field, for example:
/wp-content/plugins/contact-form7/js/spinning-wheel.js
Please note that the above path is just an example.
Thanks!

Hello Marteen,

Thank you for reaching out and I am happy about the issue you are experiencing.
I’ve checked your website and as I can see the W3 Total Cache is active.
I’ve tested the form and submitted the test on the contact form and I got the success message as you can see in the screenshot. The same is when trying from the desktop.

Can you please double-check this and let me know if the issue is still there?
Thanks!

Hello Angelica,

I am sorry about the issue you are experiencing and I am happy to help.
To confirm, you are having issues adding new plugins while W3 Total Cache is activated?
WHich instructions have you been following to fix the mistakes? Also, which updates in .htaccess you have made, and when you say they cannot be saved, can you please clarify that? Are the changes in .htaccess are not being saved or you are getting some error?
Thanks!

Hello Sachin

Thank you for reaching out, and for your purchase of W3 Total Cache Pro.
Please contact us directly via the website and provide information (latest invoice, PayPal transaction ID, or the license key) so we can find your subscription and provide assistance with this.
Thanks!

Hello Laura,

Thanks for reaching out.
Yes W3 Total Cache adds files and rules so that caching and the plugin can be used properly.
W3 Toal Cache adds the following:
1. define(‘WP_CACHE’, true); // Added by W3 Total Cache – this is important for Page Caching so if the constant is not added there will be no caching. All Caching plugins are adding the same constant.
2. in wp-content folder: advance-cache.php (for Page Cache), object-cache.php (If object caching is enabled), db.php (if Database caching is enabled).
3. wp-content/w3tc-config/ – This is where the configuration of the plugin is stored in the file called master.php
4. W3 Total Cache also creates a /cache/ folder in wp-content – The cached files are stored in that folder and served to visitors of the website.
5. W3 Total Cache is also adding the rules in .htaccess/nginx.conf (mostly Browser Cache) depending on the settings enabled.

I am not sure what is the specific issue you are experiencing, however, there is a possibility of a conflict with some other plugin. I have a couple of websites on HostGator and W3 Total Cache installed and there are no issues on those websites.

Thank you!

Hello Giada,

I am sorry about the issue you are experiencing using W3 Total Cache.
Try the following:
3. Check .htaccess File (make a backup)
W3TC will create many directives in the .htaccess file to control caching behavior. Each section will start and end with comments like “#BEGIN W3TC Page Cache core” and “#END W3TC Page Cache core”.
Ensure that no residual entries are leftover in your .htaccess file after deleting the plugin.
2. Delete wp-content files and folders
– cache folder
– w3tc-config folder
– object-cache.php (if exists)
– advanced-cache.php (if exists)
– db.php (if exists)
– upgrade folder
– delete w3-total-cache folder in wp-content/plugins/ (if exists)
3. Delete Cached Files from CDN (if using CDN)
Besides deleting all the relevant files, if you use CDN then ensure to purge the cached content from your CDN. This is necessary when you enabled the minify option in W3TC settings. You should delete the minified and combined scripts and CSS files from your CDN server to avoid the site breaking on the browser.
4. Make sure you are not using any other caching layer (server-side caching or any other plugin)
I hope this helps!

Hello Elliot,

Thank you for reaching out, and for using W3 Total Cache Pro.
You only need one license. Once you configure the plugin on the dev environment remove the license key from Performance>General settings, Licensing sub-box, license field and save all settings in the dev website. Re-enter the license in production, verify the license with the “verify license button” and save all settings.

W3 Total Cache Pro should be active after these steps!
Thanks!

Hello Ahmad,

We are not offering any coupons for a single license at the moment.
If you are interested in bulk licensing, please email us for more information.
Thanks!

Hello Fahad,

I am sorry about the issue you are experiencing and I am happy to assist you with this.
Since you have not shared the website URL can you please provide the screenshots of the mentioned issues like the plugin needs to update and the ajax errors?
Thanks!

Hello,

Thank you for your question and I am happy to assist you with this.
Can you please share more details? Are you referring to this topic/thread?
Thanks!

Hello Mateusz,

W3 Total Cache Pro licenses are valid on a per-install basis, meaning you need one for every WordPress instance you run. If you have three separate websites, you will need three licenses in total — one for each site. If you have five sites in a WordPress multisite instance, you need just one license for all five sites. If you are interested in bulk licensing, please email us for more information.
Thanks!

Hell Jared,

Does the issue occur again after the cache is cleared?
How often do you see the issue happens?
MOst likely this was a temporary hiccup until the files are uploaded and served from the CDN.
I’ve checked your website and I am not seeing any issues at the moment.
Thanks!

Hello Dominique,

Thank you for the information and the Dev team is doing the best it can.
Please understand that the issue is related to specific themes/plugins.
Thanks!

Hello Lian,
Thank you for the information.
Glad to know the issue is resolved!
Thanks!

Hello

Thank you for your inquiry and I am happy to assist you with this.
This means that the memory_limit of 128M is being exhausted. There is no particular reason why this happens with the role other than Administrator.
What you should do is to increase the memory limit
To increase the PHP memory limit setting, edit your PHP.ini file. Increase the default value (example: Maximum amount of memory a script may consume = 128MB) of the PHP memory limit line in php.ini.

memory_limit = 256M
Alternatively, you can edit your .htaccess file (Not recommended see: Apache Performance: Disable .htaccess)

php_value memory_limit 256M
If you don’t have access to these files or lack the experience to make this change, you can contact your web host and ask them to increase your PHP memory limit.

Hello Mike.

Looking at your website I see

Object Caching 419/23626 objects using Memcached
Page Caching using Memcached 
Content Delivery Network via Amazon Web Services: S3: mvpproshop-media.s3.amazonaws.com
Database Caching 2/4883 queries in 14.265 seconds using Memcached (Request-wide modification query)
Served from: localhost @ 2021-03-12 10:06:23 by W3 Total Cache

Have you switched to a regular Memcached client and not autodiscovery?
If you check this article you need to Install the Memcached Client
That requires a PHP module amazon-elasticache-cluster-client.so
https://docs.aws.amazon.com/AmazonElastiCache/latest/mem-ug/AutoDiscovery.HowAutoDiscoveryWorks.html
There are the module for:
https://elasticache-downloads.s3.amazonaws.com/ClusterClient/PHP-7.3/latest-64bit
https://elasticache-downloads.s3.amazonaws.com/ClusterClient/PHP-7.2/latest-64bit
https://elasticache-downloads.s3.amazonaws.com/ClusterClient/PHP-7.0/latest-64bit
https://elasticache-downloads.s3.amazonaws.com/ClusterClient/PHP-5.6/latest-64bit
https://elasticache-downloads.s3.amazonaws.com/ClusterClient/PHP-5.5/latest-64bit
https://elasticache-downloads.s3.amazonaws.com/ClusterClient/PHP-5.4/latest-64bit
https://elasticache-downloads.s3.amazonaws.com/ClusterClient/PHP-5.3/latest-64bit
5:15
No 7.4 or 8.0 yet. No 7.1.

Thanks!

Hello Anna,

Thank you for your inquiry and I am happy to assist you with this.

Ah yes, the PHPSESSID. This makes caching a lot harder. Make sure that caching is disabled to logged-in users in Performance>Page Cache “Don’t cache pages for logged in users”

You can also add PHPSESSID in Performance>Page Cache>Advanced>Reject Cookies filed, save all settings and purge the cache.

Thanks!

Hello Mike,

Thank you for your inquiry and I am happy to assist you with this.

There is a possible issue in /wp-content/plugins/w3-total-cache/DbCache_WpdbInjection_QueryCaching.php lines 742-744.
Change the double-quotes to single:

$strings[] = sprintf( "%s%d", str_pad( 'Total queries: ', 20 ), $this->query_total );
$strings[] = sprintf( "%s%d", str_pad( 'Cached queries: ', 20 ), $this->query_hits );
$strings[] = sprintf( "%s%.4f", str_pad( 'Total query time: ', 20 ), $this->time_total
);

to

$strings[] = sprintf( '%s%d', str_pad( 'Total queries: ', 20 ), $this->query_total );
$strings[] = sprintf( '%s%d', str_pad( 'Cached queries: ', 20 ), $this->query_hits );
$strings[] = sprintf( '%s%.4f', str_pad( 'Total query time: ', 20 ), $this->time_total );

Try this out and let me know if this helps!

Thanks!