All of a sudden Gears 2 is locking up after signing in our 2nd profile. We almost always play 2 profiles at the same time, with no problems. Yesterday it started. We even went and got another Gears game to try, still happens. We cleared the cache and removed hard drive, per xbox help (that didnt help cause we cant sign into profiles w/o hard-drive). Gears 1 works with 2 profiles signed in. Seems to be specific to Gears 2. We can play 1 profile on multiplayer no problem. Any ideas?