Can't apply CU5 - option grayed out

Hello,

I have a local, named sql server 2012 sp1 instance running virtualized on an ESX host with VMWare.  We wanted to apply cu5 to this instance and several others for the pages in memory fix.  The others worked fine, this instance the option to choose it for upgrade is grayed out.  There were no errors to provide, it was simply unavailable to apply the update.  The version of this db is 11.0.3000, like all the others that worked fine.

Anybody?

Thanks kindly,

Dianne

Dianne