I am not saying there is no issue, cp. We just did not encounter any, but then we monitor only a very small fraction of all instruments and only on a few large exchanges here in the US. Would be interesting to hear whether others do experience a recent increase in "lack of a value" indications for market data by the TWS API.
Also, visitors may find it helpful to learn about the different approaches how TWS API represents the lack of a value for numerical fields, so I'd be inclined to keep the thread.
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