This issue is due to a temporary work around that Working Title employed to develop new features for the G1000 NXi version (G1000 NXi is early access, under development, and found only in the marketplace). PC users have the option to either A) use a work around like Spad.Next or Axis and Ohs, B) uninstall the NXi version, or C) just live with the broken NXi until Sim Update 6 arrives. If you uninstall the NXi you lose it’s features like keyboard input of waypoints.
You also have option D), uninstall the NXi, and install the Working Title Garmin 1000 non NXi version.
The choice is completely up to you. I used spad.
Autopilot Hardware
The autopilot has been completely overhauled with 0.5.0, which includes some workarounds for altitude capture until such time that the sim supports the disabling of it’s own capture. This includes setting the altitude slot to slot 3 and setting the selected altitude to 99000 so it will never be captured, and using slot 1 as it should be for the preselector.
For hardware controls that control the altitude preselector, they must be configured to read and write to altitude slot 1, not altitude slot 0 (which really just reads/writes to them all, and will override all the custom AP altitude selections). If it is not possible to configure your hardware in this way, you will unfortunately have to either remove the hardware or remove the NXi. The are also third party softwares like AxisAndOhs, Mobiflight, and spad.Next that can allow you to bridge this gap if the manufacturer default software cannot.
We expect this workaround will no longer be necessary after Sim Update 6.