You can read description here: http://support.microsoft.com/kb/2640103
I downloaded hotfix, related to this KB from here: http://support.microsoft.com/hotfix/KBHotfix.aspx?kbnum=2640103&kbln=en-us
Installed it. Duing installation I notified, that this fix related ONLY to .NET Framework 4.0 Client Profile. But my application built under .NET Framework 4.0. NOT .NET Framework 4.0 Client Profile.
Rebooted system. Rebuilt my application under .NET Framework 4.0 (NOT Client Profile).
Got same error after some work time.
So I think you need to create same fix for .NET Framework 4.0, as you created for .NET Framework 4.0 Client Profile. Or suggest other ways to fix this bug.