Problem with Windows 7 802.1x prompted for authentication multiple times

I have setup a WLAN for users to bring in their own devices (devices are not on the domain). It is setup for WPA2-Enterprise/AES and it doesn't require certificates. We authenticate with a Cisco Secure Access Server 5.1.44 (setup with Active Directory).
I have configure dthe Windows 7 wireless client:
WPA-Enterprise/AES
PEAP - removed "Validate server certificate"
EAPMSCHAPv2 properties disabled "Automatically use my Windows login name and password
Advanced settings 802.1x - ticked for "user authentication"
My problem is when I connect to the WLAN, I'm prompted for authentication multiple times (x2). On the second login prompt everything logs in OK. No errors are received after the first login attempt.
Thanks

This doesn't have anything to do with eap settings?
Are the current defaults the recommended settings:
EAP-Identity-Request Timeout (seconds)........... 30
EAP-Identity-Request Max Retries................. 2
EAP Key-Index for Dynamic WEP.................... 0
EAP Max-Login Ignore Identity Response........... enable
EAP-Request Timeout (seconds).................... 30
EAP-Request Max Retries.......................... 2
EAPOL-Key Timeout (milliseconds)................. 1000
EAPOL-Key Max Retries............................ 2
EAP-Broadcast Key Interval....................... 3600
I have seen this multiple times on varying drivers and systems. The first time you login until it is cached.
Thanks,
Andrew

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