[quote name='noisesquared']I had the same problem - it'd freeze at 62% on the sync and then spit out an error, which all started after the MW2 launch fiasco. Last night, I was able to get trophies to work by going into 'compare trophies' with someone on the friends list. The sync completed normally there, and trophies worked normally afterwards.[/QUOTE]
That didn't work on mine, it still freezes on 12% then gives me that error.
It happened to me after MW2 I believe, although I could be wrong because I don't really check trophies that often.