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I’ve experienced this when I have the XSquawkBox plugin enabled. The symptom is all the AI aircraft would appear on the map (all idle, pointing north), but not visible when they are within viewable distance. I suspect certain traffic-related plugin is interfering with X-Plane’s AI traffic engine.
Perhaps this is what you call the “Reverse Stealth” technology—full radar cross-section, but invisible to the eyes!
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