The CL 01-13 expiry is setup by default to rollover on 11/21/2012. This contract no longer trades and therefor we need to roll over before this date which means that we would need to manually adjust the rollover date in NinjaTrader so that our Historical Chart Data is correctly merged.
Please go to Control Center-->Tools-->Instrument Manager. Highlight the CL in the 'Available master instruments' section and click Edit.
Subsequently select the Misc-tab and scroll to the bottom. Select the 'Contract months' row and click the '...' button that appears.
Select the 01-13 expiry month and you will see the rollover date listed. You can change the rollover date for the 01-13 contract to yesterday (November 15th) to allow NinjaTrader to merge these contracts correctly. Once this is changed you will need to reload historical data in your charts to apply the change via a right click -> reload historical data on your charts.
This roll over date will be corrected in the next release of NinjaTrader
Please contact support at ninjatrader dot com if you have any further questions.