How to reproduce:
1. Download attached project file and open this TestInputManager scene.
2. Enter Play mode (notice the Exception below in the console)

Actual result: When running in the editor on Windows with the 4.x runtime, it'll throw a NullReferenceException calling into a static method on the native plugin (Native.Init() in InControl/Source/Native/Native.cs). This is the first plugin method called (during OnEnable() as I recall) so no other plugin methods get a chance to be called, but I'd assume they'd all throw exceptions.

Reproduced with: 2017.1.3p1, 2017.2.1p3, 2017.3.1p1, 2018.1.0b8, 2018.2.0a1

Note: If you switch the runtime back to the default, it will work fine, and it also works fine in builds with the experimental runtime leading me to believe it's a bug with experimental runtime in the editor.

Fixed in: 2018.1.0f1, 2018.2.0a8