Dear Allin Cottrell
I'll  answer using your text.
What happens if you try running wgnuplot.exe (it's in the
gretl folder) directly? 

1. I see this:
Inline image 1

Do you have x12arima installed and is its location correctly stated in your gretl configuration (under /Tools/Preferences/General and the "Programs" tab)?

Allin Cottrell

2. Yes, I've the X12 ARIMA installed. But when I need it greltl returns that the file is not there.
JMMBelbute