We were able to figure out what was causing the users (Win7, Vista, OS X) not able to connect to our secure/802.1x ssid but it wasn't tied to the error message I shared but related to feature we enabled (validate-pmkid) under the 802.1x profile under layer 2 authentication.
This is probably an issue on 6.2.0.3 AOS code , I have a TAC open since this was open to address the issue with Mac devices not roaming properly.