I have had the problem twice now and haven’t been able to fix it. I have checked to make sure landing elevation is set correctly too.
Hi. After starting APU put the packs on.
Problem solved for me
After starting the engine, please check that both packs are switched on.
It is a bug known to the developer that the “OFF” section of both buttons do not light up when the packs are switched off.
One could therefore think that they are switched on.
At the moment you can only see this by the narrow black border when the buttons are pressed.
Fortunately, the 3D modelling is well done so that you can see this.
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I’ve had the same problem. Not sure why it happened.