KB article number KB title 2688247
(http://support.microsoft.com/kb/2688247/ ) SQL Server cumulative updates must be manually installed on secondary System Center 2012 Configuration Manager sites that use SQL Server Express 2688285
(http://support.microsoft.com/kb/2688285/ ) The Apply button is unavailable after clearing the “Enable PXE support for clients” option on a System Center 2012 Configuration
Continue reading major fixes included in ConfigMgr 2012 SP1
