Plugin Conflicts

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Funnel pages run outside your theme and use a few small requests of their own: the opt-in form, the redirect to the download page and the click on the PDF button. Caching, speed and security plugins sometimes get in the way of these. The fix is usually a simple exclusion.

Where to check first:

The System Diagnostics heading on the Diagnostics tab — The Diagnostics tab checks your plugins for known conflicts.

Click the Diagnostics tab. If you run a plugin that is known to need attention with funnels, a section called Detected Potential Conflicts lists it with a note on what to do. Active Plugins further down lists everything running on your site.

What the Diagnostics notes cover:

WP Super Cache, W3 Total Cache, WP Rocket: exclude every address that starts with /free/ (your funnel pages) from caching and minification, and for W3 Total Cache also exclude POST requests.
LiteSpeed Cache: add your /free/ funnel addresses and capture.php to the Do Not Cache list.
Wordfence and Sucuri Scanner: if opt-ins fail, allow your autoresponder's addresses through the firewall.
Really Simple SSL: if funnels redirect to wp-admin on some requests, check its mixed content settings.

If you changed your URL Prefix, use your own prefix in place of free.

Step by step:

Follow the note for any plugin listed under Detected Potential Conflicts, then clear that plugin's cache.
Test the funnel in a private window.
If it still misbehaves, note the time and go to Plugins in WordPress.
Deactivate your other plugins except Free List Building Website, ideally on a staging copy of your site.
Test again. If it works now, reactivate the other plugins one at a time and test after each one. The plugin that brings the problem back is the one to look at.
Reactivate everything you turned off.

Send the result to support:

The Copy Full Report To Clipboard button — Copy the full report and include it with your ticket.

Include the name of the plugin, your Diagnostics report and the Debug Log. See How to Get Support.

A real example:

Your Site used a page cache plugin, and some visitors saw an old version of a funnel after Sam changed its headline. Sam added the /free/ funnel addresses to the cache plugin's list of pages never to cache, cleared the cache, and every visitor saw the new headline.

Tips:

After any exclusion, clear all caches: the plugin's, your host's and any CDN.
Your Showcase page address, such as /free-resources/, benefits from the same exclusion.
See "404 Error on Funnel Pages" and "Emails Are Not Being Collected" for related checks.