I see this listed as resolved, but it's not for me. I've been seeing the "Allowed memory size" error all over the place, and I have the memory_limit for php set to almost 400MB.
Over at VPS.net they sent me this:
We analyzed system logs, they show a problem with WP plugin 'w3-total-cache'.
(PHP Fatal error: Out of memory (allocated 32243712) (tried to allocate 262109 bytes) in /home/site-a/public_html/wp-content/plugins/w3-total-cache/lib/W3/Cache/Apc.php on line 40).
but I also got this (on a site not running total cache)
Fatal error: Out of memory (allocated 34865152) (tried to allocate 193760 bytes) in /home/site-b/public_html/wp-content/plugins/post-plugin-library/common_functions.php on line 350
Fatal error: Out of memory (allocated 34865152) (tried to allocate 17424 bytes) in /home/site-a/public_html/wp-includes/theme.php on line 180
"Fatal error: Allowed memory size of 33554432 bytes exhausted (tried to allocate 30720 bytes) in /home/site-a/public_html/wp-admin/includes/template.php on line 3317"
I'm really at my wits end. I *want* to use W3 Total Cache, but it seems to keep fighting me and causing problems.