Critical error since patch

Today there was a new patch. every since the download I can not play a game - champion selections works, all fine, once the game cuts to loading screen I will get a system error "A critical error has occured and the process must be terminated" Yesterday game was running fine, so there is no doubt, patch has caused it. Instructions on fixing this issue would be welcome. Cheers EDIT: Todays patch fixes the issue. Note: they should have also implemented into the patch to remove anyones leavebuster, I have to wait 20 minutes for each game.
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