Jon,
I've made some changes I'd like you to try. Download this file and copy it over the existing NCPlot.exe:
http://home.wmis.net/~smartinz/softw...tv2/update.zip
The changes are to the plot controls. All of the plot controls now work, including step forward / step backward. Click the viewport then press the "S" or "B" keys to step the program. Play around with it and see what you think.
You'll also notice that drawing is MUCH faster. The only downside to this is that the viewport will need to be refreshed after making edits to the program. To do this, press the Plot toolbar button or use the menu Draw / Plot.
Thanks,
Scott