I just bought it since I loved the demo but never felt like paying full price for it...my account was hacked a week ago, ms got it back to me today and restored 10,000 ms points to make up for the 8,200 I lost and gave me 1-month live codes on three seperate occasions, so when I got back online today and saw it I bought it right away. It froze on the menu for me as well, I cleared my cache and reinstalled it and it works just fine now. My wife tried to play it and it locked up, she redownloaded her profile and it fixed the problem. I'm guessing both ways might work, but clearing the cache is the time honored fix for all live screwups, so I'd try that first. Good luck!
Big thanks to jtr1gg3r for the sexy new sig!
70,000GS 26 Oct 2010- RB3 "Hometown Threwdown"