Is _MOUSEMOVEMENTY and _MOUSEMOVEMENTX supposed to act this way?

[bplus]

Man I had to remind myself of _ScreenClick and I seem to recall _MouseMovementX (sounds like an old Disney ad campaign) wasn't working.

@Pete what did you want from or expect or need from _MouseMovementX ? (That term also drops a hint of a recent mouse presence.)
Wiki: "The _MOUSEMOVEMENTX function returns the relative horizontal position of the mouse cursor as positive or negative values."

Seems like an easy thing to code from a click by saving the mouse x, y and then calc the current location or click from the saved mouse x, y.