1.0.3 Cabin Altitude gauge starts full scale high and moves to full scale low when cold and dark

[MediumRareBaku]

1. Load the aircraft, cold and dark
2. Enter the cockpit, swap to FE station, observe cabin altitude gauge
3. Needle starts full scale high climb, moves to full scale low descent, stays there.
4. Opening doors, turning on power, turning on the APU and a pack doesn't change it.

I uninstalled -- including deleting the WASM folder -- and reinstalled and the behavior is still present. I did not have the aircraft selected in the menu when doing so.