Answer yes to import callibration (though same problem when answering no)
No calibration UI and Console has error below
Click off the calibration module so Inspector displays something else, then come back and it works
NullReferenceException: Object reference not set to an instance of an object
MxMEditor.CalibrationModuleInspector.OnInspectorGUI () (at Assets/Plugins/MotionMatching/Code/MxM/Editor/Inspectors/CalibrationModuleInspector.cs:264)
UnityEditor.UIElements.InspectorElement+<>c__DisplayClass58_0.<CreateIMGUIInspectorFromEditor>b__0 () (at <208995a09fe148f5a6f6c571838c154f>:0)
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)
When creating a new Calibration module the UI code throws a Null Reference. Workaround is to click off the calibration object then back again.
Repro: