Hi,
1 :In the firewall logs I see one side cookies is zero so I think first Ike itself is getting dropped.
2: What client are you using on the computer to initiate IPSec tunnel? Is there any difference in terms of the config/client in the working and non-working one?
3: You can try disabling windows firewall or take the wireshrk capture on the window machine to see if something getting dropped on the computer or any if there is incoming packet at all. Capture can also reveal what is being sent to the Firewall and wheather it's matching with the config.
4: At the end we can do 'debug ike detail' to see what's happening in the backend. In SSGs we can take snoop to see what's firewall is receiving.
Thanks,
Vikas