Remember for SharePoint 2010 updates – you must manually run psconfig
Microsoft Security Bulletin Advance Notification for September 2011:
Included in the heads up email is the notification that SharePoint 2010 will get an update (barring any last minute changes).
Remember for SharePoint 2010 updates (and it’s related kind like search server express), you need to run psconfig manually AFTER the updates. It is not automatic. Failure to do so will mean that backup on SBS 2011 will fail after the install of this update.