I'm currently having my logs spammed with this error:
Warning: apc_store(): Potential cache slam averted for key 'www.amateurwriting.net::cache::ctools_plugin_files:og_migrate:og_migrate' in DrupalAPCCache->set() (line 206 of /<HTML-ROOT>/sites/all/modules/apc/drupal_apc_cache.inc).
Every access or click of the page generates a new error, and clearing cache does not seem to help.
Google seems to indicate this is related to version 3.1 of APC.
Anyone else getting this?