NAV mode does not work ?
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This is unfortunately a quirk of the Working Title GNS430/530 logic.
The logic behind the autopilot controls on the EFB is deliberately very basic to minimise the likelihood of compatibility issues with the various GPS units. We are applying very little (if any) custom logic to the autopilot controls and once they are pressed, they simply trigger the respective autopilot control assignments in the simulator.
Therefore any weird logic quirks like the one you have reported are linked to the GPS units themselves. There are some fixes/improvements expected in Sim Update 15 relating to the Working Title GNS430/530 which may change/improve this behaviour.
Mark - Just Flight