Not compatible with W3 Total Cache

As far as I know, W3 Total Cache has no problem with Contact Form 7. Have you checked other plugins or theme yet?

I guess you’ll be able to find some clues if you can check PHP error logs.

Where do I check the PHP error logs?

It depends on the server. Consult your host support.

I have the same problem and have tried just about every configuration option imaginable. If page caching is disabled in W3TC, the form submission works fine. If page caching is enabled, the spinner doesn’t stop. The contact form is in the footer and even if the page itself is not getting cached, the form submission still doesn’t work. As noted above, the email does send, but I’m using an on_sent_ok setting to open a confirmation modal, which never shows.

If I use WP Super Cache, it works fine. If I use every other option in W3TC, it works fine. The problem is simply when page caching in W3TC is activated. I have tried deactivating all of the options on the page caching settings page, and I have added footer.php to the ignore list, all to no avail. Thanks for any insight you have on this.

I have the same issue. As soon as I turn on Page Caching I just get the spinning arrow from Contact Form 7.

Yes, same issue here as well. Turning on Page Cache in W3TC prevent WPCF7 from working …

Even when logged in and with the option “don’t cache pages for logged in users” enabled. I also disabled the option “Cache URIs with query string variables” which should do the trick since WPCF7 uses Ajax with a GET query string.

Any clues?

Got it … at least in my case.

Is by any chance the “debug” mode enabled for page cache (or others?) If yes, then that’s it.

I observed the Ajax JSON return value and, to my horror, I noticed that after the JSON object returned for WPCF7 there was a nasty HTML comment added by W3TC with debug information (I had debug enabled).

This is actually a (fairly nasty) bug in W3TC. It should not add debug information for application/json content type (actually no other types except html and friends).

Yes. That was it. Thank you very much.

Worked like charm! Thank you so much normadize!

Just like normadize said :
Turning on Page Cache in W3TC prevent WPCF7 from working …

TURN OFF PAGE CACHE FIXES THE PROBLEM !
that worked for me too…. owe you bigtime normadize ??
https://www.fenexpert.ro

Thanks so much — that worked brilliantly for me as well

I had added the following to the “never cache” area, but that didn’t work, which surprised me. I guess it was because it was still adding the comment:

.*contact.*
/wp-content\/plugins\/contact-form-7\/.*