On my account on www.xbox.com, in the section "my xbox > games", i'can't sort the games by "for last played".
Yesterday i play GoW2 and it show the last day a have played is 8/3/11.
When I compare GoW2 achivements with you, I see you've gained achivements as late as 9/13/2011.
Try logging out and back into xbox.com?
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