Game is updated; any affected parties please try again (make sure Steam’s downloading the update).
EDIT: Also, if you’ve made any changes to UDKSystemSettings.ini to try to fix the issue and failed, please just delete that file altogether and let the game recreate it.
I updated the game. I can get in.
But it is completely broken. I have played over 700 hours and within a couple of minutes seen my weapon pass through people with no effect.
Please back out and restore the previous version