I saw 5 people in a match complaining about something I saw only briefly, infinite scout bombs. There was this thick blue cloud that you couldn't see through, and it reminded me vividly of how it looked in the days of the kong ultra trainer hack module when people would just cloud the base with bombs and spam.
Now, I know it is logical to think that steam/webgl cannot be hacked, but is that a 100% surety? At any rate, there's a bug to weed out. If you look at the chat logs within the last hour or so in the US rooms, you'll see the complaints. I have no visual proof cause as I said, it was only briefly visible for me.