Same behavior here. Not sure if on the exact same infrastructure / environment yet, but will find out.
Did you manage to get a solution?
probably related to a buggy Keyboard driver in the uEFI - http://kc.mcafee.com/corporate/index?page=content&id=KB79297&actp=search&viewloc ale=en_US&searchid=1383827970629
let your platinum support person know you are experiencing this issue.