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I think you might have found the shortcoming of using Insulfrog with DCC. The specific design of Insulfrog has the two frog rails extended much closer to the frog than other makes of dead frog point, this is an excellent feature for DC as it gives a lot more metal on the frog, but for DCC it means that you will get a momentary short as the wheel tread touches both of the frog rails (which are at opposite polarity).
 

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The momentary short is usually not enough to shut down the command station, but is enough to deprive the loco of power.

It should be possible to rewire the points as if they were live frog, but a bit of a big job after the track has been laid due to the need to fit insulated joiners.
 
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