I had this problem before but don't remember how I solved it. I'm using NT 7.0.1000.6 and have the ZenFire feed. And I'm using Windows 7 Pro SP1.
When I try to switch instruments within a chart it goes blank with no data. All the charts are doing this. I can switch the time period within a given instrument, but can't change the instrument without losing the data.
Thanks for your help.
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