See the Star Tribune article HERE. It appears So has had family troubles, including a couple of incidents during the tournament. It's alleged that So’s former chess coach at Webster University, Susan Polgar's husband Paul Troung, who was angry over losing So on his team had a hand it it. Funny...the name Truong pops up again and it involves another unsavory incident.
For more incidents involving rule violations and arbiter decisions, etc. check out Chess News.