Has anyone else contacted BitcoinCharts about this? This is very frustrating, I've been using the SierraChart feed since 2011 and BitcoinCharts just now stops providing historical trade data without any warning.
I haven't contacted them, but apparently they have a limit to query the Markets API "
once every 15 minutes" (
http://bitcoincharts.com/about/markets-api/)
this might be the reason, i am not sure, but i think i had not seen this limit before. Regardless of the time limit i was not able to retrieve the historical data in any case.