Historical Data

[NinjaTrader_Ben]

Hello,

Note the steps you are taking with the 15 minute timeframe and apply them to the 30 minute timeframe. There should be absolutely no difference in proceedure or the availability of volume data. If the 15 minute time frame works, the 30 minute time frame will work.

[designer]

i followed the same process for the 30 min charts, I still had problems with the following instrument symbols...DDM, QLD, SKF, of the ones i use.
Please try these as well.
Thanks.

[NinjaTrader_Jason]

I tested the DDM on my end while connected to IQFeed and it worked as expected on my end. See screenshot.