Glad that helped, I should have mentioned, when you click that tab you're only correcting for preview purposes (hence the jaggies) With NTSC Widescreen your pixels are have a 1.2-to-1 ratio, but your computer has 1 to 1. The PAR Correction just allows you to preview what it will look like when properly displayed (on a monitor or TV) It doesn't effect your output at all, it just shows roughly what your output looks like.
Jeff McBride
Motion Graphic Designer/Editor
LimeGreen
Chicago, ILwww.limegreenproductions.com