Looks like the live trade socket from bitcoincharts is not returning any data after subscription. A message to tcatm via the forum or a message to the bitcoincharts contact email may alert the site to a malfunction.

Frankly, I'm surprised that it has worked for four years, as the API is not documented or advertised, and is only known from the original sierrachart bridge code (and is likely the only code using the data stream).