While APC-based object & database cache seemed to work at first, I woke up to a site full of the following, never-seen-before error:
Warning: apc_store() [function.apc-store]: Unable to allocate memory for pool. in /home/domain/public_html/wp-content/plugins/w3-total-cache/lib/W3/Cache/Apc.php on line 40
I have a 256MB PHP memory limit, and 92M for WP on a dedicated server. Does W3C Total Cache require more?