Hello Dave 🙂
P2A v2.6.1.2 / X-Plane v11.50-b12 / XPUIPC v2.0.0.0 / Windows 10
With the latest version of P2A, when I connect P2A to X-Plane via the XPUIPC plugin, P2A connects well, but the connect button doesn't turn green and stays in the "Connect" state.
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[ EDIT by JPR ]
I went back to X-Plane version v11.50-b11 (version v11.50-b12 was removed by Laminar because it had problems)
=> with X-Plane v11.50-b11, I no longer have the problem with the Pilot2ATC connect button. So the problem came from XP v11.50-b12.
🙂