QTR-Quadtone RIP

Hallo,

according to the Quad Tone Rip User Guide page 20 in the Curve Creator 
Tool the Create Curve Button should be visible, in my case i only see 
the Show Curve Button where the Create Curve Button should be.

I try to make a new Curve for Harman Gloss FB AI from an existing other 
curve.

Where/Why did the Create Curve Button disappear? How can i create the 
Curve now?

Best Regards

Rainer Taube