there is an unexpected mismatch in SQL versionafter the update
SSMS version \ TSQL : 11.0.5582.0
Registry version : 11.0.6020.0
Control Panel version / setup version ( expected) : 11.3.6579.0
Do you have more than one instance entries in HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SQL Server ? Is the SSMS version the output of SELECT @@VERSION? or the displayed version in Object Explorer? 😎