Today Naughty Dog released a new patch to fix some of the issues with the multiplayer beta of Uncharted 2: Among Thieves. The 14 MB update makes the following changes:

General
Grenade explosions now apply damage properly

Matchmaking
Players should no longer get hung up in matchmaking for long periods of time

Bug Fixes
Ranks should no longer reset randomly
Quitting the game will no longer reset the PS3
Player collision – players should no longer get hung up on each other when moving through the environment
Player will now be killed if stuck in falling animation for too long
In Plunder mode, treasures will no longer disappear during matches


All ranks will be reset with the patch. Vouchers for the Uncharted 2 beta were packaged with copies of inFamous.