I installed wp-cache. It worked well on PHP4. Then I enabled PHP5. wp-cache ceased to work. Now I get these messages:
"Your WP-Cache config file (/home/USER/domains/DOMAIN.COM/public_html/wordpress/wp-content/wp-cache-config.php) is not writable by the Web server. Check its permissions."
My wp-content is mode 777. wp-content/cache is mode 755 and owened by apache:apache Execute permissions for directories should be ok, too.
EVEN MY WEBHOTEL ADMIN PANEL SAYS:
Write access to the directory containing ...wordpress/wp-content//cache/wp_cache_mutex.lock is not allowed for the process's effective uid, or one of the directories in pathname did not allow search (execute) permission.
If I go back to PHP4 everything works. So, is there some change in effective UIDs or something?