I guess that something has happened either with their data acquisition scripts (deadlock, infinite loop, I don't know), either they couldn't retrieve data (blocked by the exchanges).
I've seen such situations now and then on various websites showing the market data.
As a nice coincidence, it has started working just minutes before my check. Now it's back to normal, obviously, without the data it couldn't read.
21:24:38 5121.38 0.00925
21:24:26 5119.88 0.00286
13:03:09 4943.1 0.93620
13:03:05 4941.88 1
13:03:03 4940.41 2.92205
More than 8h without data is indeed a lot.
As others said, another option I also use is
https://cryptowat.ch my wisdom ticker for bitstamp is still receiving data and producing candles. the problem is anytime the chart is reloaded, it deletes all the data going back to 11:03 UTC yesterday:

so the problem is getting worse and worse. soon, these candlestick charts will be worthless for any sort of analysis and the indicators/moving averages will all be wrong. something must have happened at 11:03 UTC because the other wisdom charts are frozen there too and new data is not being saved on wisdom's servers.
i don't have high hopes at this point. the owner has kept the dead okcoin and btc-e charts at the top after they've been shut down for years. the coinbase chart has been dead since last year. in fact, most of the exchanges it lists are dead now. the only important ones left are stamp and bitfinex and if those don't work anymore, well.....1Referee is probably right that it's going the way of clarkmoody.