Title Studio - Spline scaling problem

I’m trying to animate a spline object by expanding it in the Y direction from the centre. The Scale Y parameter in the Shape Position window doesn’t allow me to do this, and the shape track seems the only track that will accept keyframes. I do have the Scale Anchor option in the Lock to Position mode. I can achieve it by using the sizing handles when the Material - texture track is selected, but when I create keyframes on this track, they don’t do anything and disappear if I change tracks. Can anyone help?

I’ve found a workaround. A Spline Primitive will scale around its centre, but only its centre. If I then convert it into a Spline Object I can do what I want, but only around its centre.
I’ve raised a ticket for this as I think it’s a bug.