Hello

You may remember that some time ago I published a web post regarding output cache stops working after installing MS11-110:

http://blogs.msdn.com/b/calvarro/archive/2012/01/26/moss-2007-output-cache-stops-working-after-installing-security-update-for-the-net-ms11-100.aspx

Like I pointed SharePoint 2010 April 2012 CU fixes that issue. The public info regarding that change has been publishing on the following KB:

http://support.microsoft.com/kb/2714963

I hope it will be useful for you.

Héctor Calvarro Martín. SharePoint Dev/Core. Microsoft Support Escalation Engineer for EMEA