Please check your SharePoint on Windows 2008 R2 systems for this issue

Hello All, There has been an issue discovered if you have Windows 2008 R2 and SharePoint 2010, and you install any of the following fixes KB2769369, KB2757638, KB2756920, KB2742598, KB2742598, or KB2736418. You may notice the following symptoms While the SharePoint site framework loads; no authenticated content will load or is accessible. SharePoint becomes entirely useless to users and admins. This does not happen immediately after patching; It seems to take several hours after the reboot...(read more)