Well, I finally had some time to look into this. I can't reproduce the lines that I see in your screen caps. At this point I would suggest looking at that frame processed throught the script, but previous to encoding and let me know the results so that we can determine if it's a Avisynth plugin issue or encoder related.

INv8r's problem got me to check this out with ESB finally, and I did notice that the final crop values need to be modified slightly. I will update the script once I get the correct values (and subtitles!) for ROTJ in there as well.

-G