OKCoin Not OK?

While researching the post on Bitcoin Bid/Ask and Arbitrage, I discovered an interesting resource for tracking global bitcoin prices. A sample display is shown below, with bitcoin exchanges listed in descending order of 'volume'.

bitcoincharts.com/markets

The green and red colors show the current price trend on the exchange, while 'Colors will fade to black slowly depending on how long ago the last trade happened.' OKCoin, the first exchange listed, shows a volume nearly six times the volume of the second exchange listed (it might even be more than all of the other exchanges combined), although the data is from '3 days 3 hrs ago' and is shown in black. The Wikipedia entry for OKCoin says,

OKCoin.com is a Chinese digital currency trading platform and exchange based in Beijing. OKCoin was founded in June 2013 and by 2014 had grown to become the largest Bitcoin exchange in China. As of June 2014, the company has over 80 employees.

Coindesk.com has a news page for the exchange -- OKCoin Bitcoin Exchange News -- where the most recent entry says, 'OKCoin Restricts Bitcoin Deposits for US Customers' (31 Aug 2015). That doesn't explain the entry in black. Is it a public holiday period in China or is there a technical problem? To be continued...