Yesterday Microsoft released the Cumulative Update 5 (CU5) for Scom 2007 R2.
This new update contains some additional fixes for Operations Manager 2007 R2 + support is added for Red Hat 6.
You can download the CU5 package (948.0 MB) here: http://www.microsoft.com/download/en/details.aspx?id=26938
The KB2495674 article apparently is not online yet but can be found here: http://support.microsoft.com/kb/2495674
For instructions on how to install a CU package in general (blog is written for CU4 but best practices can be followed for installation of CU5 as well) you can check this :http://blogs.technet.com/b/kevinholman/archive/2011/02/01/opsmgr-2007-r2-cu4-rollup-hotfix-ships-and-my-experience-installing-it.aspx