Hello Andrew,

Thank you for reaching out to us.

We have tested this on our end and we can not find the conflict with W3TotalCache since I'm using it also.

Would you be able to provide us with a staging site, along with WP-admin (Administrator) user, FTP, and the database, so our developers can debug the plugin, and see what's going on?

If you're not able to provide us with a staging site, can you clone your website?

If yes - I'll ask you to install the Duplicator plugin. It will generate a couple of files that you can send me (along with the log-in credentials), and then I can create an exact copy of your website, see what the issue is and try to resolve it.

The Duplicator plugin can export only up to 500MB of data, so if your site is bigger than that, please use the All-in-One WP Migration plugin.

Please note that the files will be too large to attach to the ticket, so you can upload them via wetransfer.com and just send me the link.

Since this is a public ticket make sure to leave a PRIVATE response.

Looking forward to your reply.

Hello Andrew,

This is very strange because we recommend W3TotalCache and we have never had a conflict with it. I personally use it on my site and everything works fine. 

We will forward your ticket to our level 2 agents so they can take a closer look and as soon as we get some feedback from them we will contact you.

Hello Andrew,

Would you be able to provide us with a staging site, along with WP-admin (Administrator) user, FTP, and the database, so our developers can debug the plugin, and see what's going on?

If you're not able to provide us with a staging site, can you clone your website?

If yes - I'll ask you to install the Duplicator plugin. It will generate a couple of files that you can send me (along with the log-in credentials), and then I can create an exact copy of your website, see what the issue is and try to resolve it.

The Duplicator plugin can export only up to 500MB of data, so if your site is bigger than that, please use the All-in-One WP Migration plugin.

Please note that the files will be too large to attach to the ticket, so you can upload them via wetransfer.com and just send me the link.

Hello Andrew,

We would need a WP-admin user, FTP, and the database, so our developers can debug it.

Can you please send this and I will be happy to forward it to our developers?

Looking forward to your reply.

Hello Andrew, 

Thank you for that. We will forward this to our colleagues so they can try to debug and as soon as we get feedback from them we will contact you.

Have a nice day.

Hello Andrew, 

It turns out that we need a staging site for this after all. 

Would you be able to provide us with a staging site, along with WP-admin (Administrator) user, and the database, so our developers can debug the plugin, and see what's going on?

If you're not able to provide us with a staging site, can you clone your website?

If yes - I'll ask you to install the Duplicator plugin. It will generate a couple of files that you can send me (along with the log-in credentials), and then I can create an exact copy of your website, see what the issue is and try to resolve it.

The Duplicator plugin can export only up to 500MB of data, so if your site is bigger than that, please use the All-in-One WP Migration plugin.

Please note that the files will be too large to attach to the ticket, so you can upload them via wetransfer.com and just send me the link.

Looking forward to your reply.

Hello Andrew, 

In the meantime, we found out that the issue is with them and they said that it should be resolved in the next update. You can find a solution and explanation at the following link https://wordpress.org/support/topic/uncaught-error-call-to-undefined-function-wp_parse_url/

We tested this solution and we can confirm that it worked. As soon as they resolve it on their side, everything should be fine.

If you have any more questions please open another ticket and we will gladly help you there.

We wish you all the best.

Hello Andrew, 

I forgot to mention sorry you need to apply these changes https://github.com/W3EDGE/w3-total-cache/pull/549/commits/4ba2b5932f35c89354e7ab139f37d9482edf23a2 in the file DbCache_WpdbInjection_QueryCaching.php in wp-content/plugins/w3-total-cache.

Hope this helps.