1. I connect to the Market Replay. Session 09/02/2010.
2. Open a chart for for FESX 03-10 with range 6
3. At the begining the chart is empty. All Ok.
4. Load an indicator to process the OnMarketData event. (Zi7Borrar02.cs ; only Prints to Output window).

5. Minimize the chart window.
6. Play the Market Replay.
7. The OnMarketData method is not executed (the OnStartUp either). You can check it by Output window.
(If restore the chart window, the OnMarketData takes a long time to start executing)
(I think this problem only happens if the chart has not bars at the begining).
Saludos
Edit: beta8





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