I keep getting the follow error in my Apache log:
[Wed Sep 18 17:59:20 2013] [notice] Apache/2.2.22 (Ubuntu) PHP/5.3.10-1ubuntu3.8 with Suhosin-Patch configured
I was having this exact error and I just restarted the server (restarting apache didn't help).
Might consider it if you've just done a apt upgrade
apt upgrade