When visiting page 2 of my blog I get the error:
Strict standards: Declaration of W3_Cache_Apc::delete() should be compatible with W3_Cache_Base::delete($key, $group = '') in /path/to/wp-content/plugins/w3-total-cache/lib/W3/Cache/Apc.php on line 15
Call stack: http://i.imgur.com/DVPMGZv.png
Fatal error: Call to undefined function apply_filters() in /path/to/wp-content/plugins/w3-total-cache/inc/define.php on line 119
Call stack: http://i.imgur.com/Hy3qzC6.png
This is after upgrading my site from WP 3.5 to 3.6. PHP Version 5.5.1-1~precise+1
Edit: Bug #2 is already resolved here.