App Layering 2011 : After ELM Upgrade to 2011 from 2005, adding layer version gives "The issuing certificate does not have a usable private key."

--after upgrading ELM from 2005 to 2011 -- getting an error when we try to add a version to a layer "The issuing certificate does not have a usable private key." -- have offload compositing enabled on vCentre connectors...