Is wp-content writable by the web server?
• Is there a wp-content/wp-cache-config.php ? If not, copy the file wp-super-cache/wp-cache-config-sample.php to wp-content/wp-cache-config.php and make sure WPCACHEHOME points at the right place. “plugins” should be “mu-plugins” if you’re using WordPress MU. • Is there a wp-content/advanced-cache.php ? If not, then you must copy wp-super-cache/advanced-cache.php to it with this command while in the wp-content folder. (WordPress MU users should replace “plugins” with “mu-plugins”.) cp plugins/wp-super-cache/advanced-cache.php advanced-cache.php • If pages are not cached at all, remove wp-content/advanced-cache.php and recreate it, following the advice above. • Make sure the following line is in wp-config.php and it is ABOVE the “require_once(ABSPATH.’wp-settings.php’);” line: define( ‘WP_CACHE’, true ); • Try the Settings->WP Super Cache page again and enable cache.