I found a pattern for myself but do not know if it helps you.
When I update the fbw and try a fly it also stucks. I got to shut down the msfs and have also to restart the pc. I can not load msfs again without a restart because some problem in the background with steam.
After the restart I am able to start a flight and the loading is much faster. If the fbw gets an update, same problem. Load, stuck the first time, stopping msfs via task manager, restart, after that it works.
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