whatsthatbugcom

I swapped the position of those 2 entries in advanced-cache.php, and pages are being cached – if I telnet localhost 11211, stats and stats cachedump show that there is relevant data. But they are not being served.

These lines are still filling up the php-fpm error log:
[10-Sep-2014 15:13:20 UTC] PHP Warning: wp-ffpc clearing scheduled hook wp-ffpc-precache-task in /var/www/html/wtb.com/wp-content/plugins/wp-ffpc/wp-common/plugin_utils.php on line 126

Any thoughts on why the cached pages aren’t being served now?

Could this have any relevance? This is scrolling in my php-fpm error logs:

[10-Sep-2014 13:36:01 UTC] PHP Warning:  wp-ffpc clearing scheduled hook wp-ffpc-precache-task in /var/www/html/wtb.com/wp-content/plugins/wp-ffpc/wp-common/plugin_utils.php on line 126
[10-Sep-2014 13:36:08 UTC] PHP Warning:  wp-ffpc clearing scheduled hook wp-ffpc-precache-task in /var/www/html/wtb.com/wp-content/plugins/wp-ffpc/wp-common/plugin_utils.php on line 126
[10-Sep-2014 13:36:11 UTC] PHP Warning:  wp-ffpc clearing scheduled hook wp-ffpc-precache-task in /var/www/html/wtb.com/wp-content/plugins/wp-ffpc/wp-common/plugin_utils.php on line 126
[10-Sep-2014 13:36:11 UTC] PHP Warning:  wp-ffpc clearing scheduled hook wp-ffpc-precache-task in /var/www/html/wtb.com/wp-content/plugins/wp-ffpc/wp-common/plugin_utils.php on line 126
[10-Sep-2014 13:36:12 UTC] PHP Warning:  wp-ffpc clearing scheduled hook wp-ffpc-precache-task in /var/www/html/wtb.com/wp-content/plugins/wp-ffpc/wp-common/plugin_utils.php on line 126
[10-Sep-2014 13:36:12 UTC] PHP Warning:  wp-ffpc clearing scheduled hook wp-ffpc-precache-task in /var/www/html/wtb.com/wp-content/plugins/wp-ffpc/wp-common/plugin_utils.php on line 126

I thought it might be helpful if I post my nginx config for whatsthatbug.com:

server {
    # URL: Correct way to redirect URL's
    server_name whatsthatbug.com test.whatsthatbug.com;
    rewrite ^/(.*)$ http://www.whatsthatbug.com/$1 permanent;
}

server {
    server_name www.whatsthatbug.com;
    root /www/htdocs/wtb.com;
    access_log /var/log/nginx/whatsthatbug.com.access.log;
    error_log /var/log/nginx/whatsthatbug.com.error.log;
    include templates/common.conf;

 location ~* \.(?:js|css|png|jpg|jpeg|gif|ico)$ {
        expires 1m;
        add_header Pragma public;
        add_header Cache-Control "public, must-revalidate, proxy-revalidate";
 }

# SECURITY : Deny all attempts to access PHP Files in the uploads directory
location ~* /(?:uploads|files)/.*\.php$ {
    deny all;
}

    location ~ \.php$ {
        try_files $uri =404;
        include /etc/nginx/fastcgi_params;
        fastcgi_index index.php;
        fastcgi_pass php5-fpm-sock;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        fastcgi_buffers 16 16k;
        fastcgi_buffer_size 32k;
    }

location / {
                        try_files $uri $uri/ @memcached;
                }

                # try to get result from memcached
                location @memcached {
                                default_type text/html;
                                set $memcached_key data-$scheme://$host$request_uri;
                                set $memcached_request 1;

                                # exceptions
                                # avoid cache serve of POST requests
                                if ($request_method = POST ) {
                                                set $memcached_request 0;
                                }

                                # avoid cache serve of wp-admin-like pages, starting with "wp-"
                                if ( $uri ~ "/wp-" ) {
                                                set $memcached_request 0;
                                }

                                # avoid cache serve of any URL with query strings
                                if ( $args ) {
                                        set $memcached_request 0;
                                }

                                if ($http_cookie ~* "comment_author_|wordpressuser_|wp-postpass_|wordpress_logged_in_" ) {
                                        set $memcached_request 0;
                                }

                                if ( $memcached_request = 1) {
                                                add_header X-Cache-Engine "WP-FFPC with apc via nginx";
                                                memcached_pass memcached-servers;
                                                error_page 404 = @rewrites;
                                }

                                if ( $memcached_request = 0) {
                                                rewrite ^ /index.php last;
                                }
                }

                ## rewrite rules
                location @rewrites {
                                add_header X-Cache-Engine "";
                                rewrite ^ /index.php last;
                }
# PLUGINS : Enable Rewrite Rules for Yoast SEO SiteMap
rewrite ^/sitemap_index\.xml$ /index.php?sitemap=1 last;
rewrite ^/([^/]+?)-sitemap([0-9]+)?\.xml$ /index.php?sitemap=$1&sitemap_n=$2 last;

}

As an additional interesting data point, I have Cache Preload enabled in the w3tc settings, and we have thousands of pages of content, so it seems that page_enhanced should be chock full of _index files!

I am seeing the same errors. WordPress 3.5.1, and the latest version of CF7.

Sorry, I meant to post an update showing how I fixed it.

http://www.clickthrough-marketing.com/how-to-fix-auto-post-thumbnail-on-wordpress-3.4-seo-friendly-800610805/ was the key.

Also, regenerate the thumbnails using the Auto Post Thumbnail plugin.