Interestingly similar issue had been (supposedly) resolved in recently released EEPC 5.2.6.
So it might have been also added to EEPC 6.0.2.
5260.1 Change to new credential provider that supports single-
sign-on with Windows Smartcard
logon (Vista, Win7)
This release includes a new credential provider that allows customers to use single-
with Windows Smartcard logon on to Vista and Windows 7. The new credential provider also
resolves the issue with expired passwords for domain users on Windows 7 machines.
I am running 6.0.2 so unfortunatley it wasn't added. I opened up a service call on this almost a year ago and it wa escalated to Tier 3, so I was hoping this would have been resolved.