I've been struggling to find a way to keep the aspect ratio from becoming squeezed when I edit videos recorded off of TV to DVD with AVS Video Editor 6.0. Every time I imported my VOB files into the program they became squeezed on the right and left sides, leaving black bars on either side. I finally FOUND the solution!
The key is to import ONLY the "Video_TS" file into AVS Video Editor, and NOT the VOB files as I had been doing. Once I did that, the video imported just fine with no squeezing of the video, and it edited a beautiful copy.
I hope others who have this problem will find this post and save the countless hours I wasted finding a solution.