Hi Team.
Starting a New drawing
Initially the UCS icon grips can be selected (by clicking) and can be used to move to an origin of your choice.
Once on its new origin the grips are no longer available.
Th Ucsicon command has the option of 'Selectable' which when checked is still ON. Its the same for AutoCAD R2019 LT
Has any of you got any ideas why this happens.