Title explains it all. If you haven't read the 4.04 patch notes yet, you should have seen that they nerfed Viper. They decided to make most of their changes to her wall and smoke and not her mollies, despite them being the most busted part...

Mid game (up 7-1, lol) our match just kicked me back to queue. I could not rejoin the match and it's not in my history. WTF happened?