Ultra Scatter Pro - I am unable to run it more than once, the Scatter button is greyed out

HyeVltg3

Not sure if I missed something in the PDF but I run USPro, scatter a tree object, dont like the output so I delete the Instance USPro created and then try to run USPro script again, but the Button to execute the script is greyed out. It shows up as clickable if I change to Matrix, but Surface and Volume shows the same greyed out button.

The only way to get it to work is to close Daz, wait for it to unload and then re-open.

 

EDIT: figured it out - I was not setting a proper Target Node, misunderstood what it was, thought it was what the trees would be scattered around, not On. :D