Why did TDAmeritrade just cut their DX chart feed?

On the paid site I often feature the /DX chart which is TDAmeritrade ticker symbol for continuous dollar futures.  In other words, the long term dollar chart.  Its been working for years but now suddenly when I select it from the drop down list I get an error.  Same thing for the monthly charts (i.e. /DXM7, /DXU7, etc.).  It's interesting to say the least.