I think you may have hit on something.

I was the guy trying to pose the thing, and what I meant by "unpredictable" was that dragging the thing in one view sometimes resulted in it moving in directions I hadn't anticipated, or were not apparent when I was moving it in a particular view. Like,if I was using the left view, I would move it relative to X and Y, but find that it has displaced itself considerably in the Z axis.