Welcome to the NinjaTrader Support Forums!
So that I may further assist you could you answer the following questions.
Who are you connected to? This is displayed by green on lower left corner of the Control Center window.
What instrument do you have selected? (Example: ES 12-12, CL 12-12)
Do you receive an error on screen? Are there errors on the Log tab of the Control Center? If so, what do these errors report?

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