Hi Budbud,
Effectively it happened with a custom cold/dark panel : this is my default setup when launching the sim.
When I launch a flight session with my custom load state, and when somewhere in the flight the plane goes overspeed, the siren starts and cannot somehow be stopped, even when the speed is normal again and the eicas message canceled.
That issue dit not occur with any original panel state.
Strange ...
Thank you for your help.
RN