I have had this problem and fixed it, but my driver's side was binding nasty again in the front so I couldn't use it. It already has the SBC brackets, but it had come lose again. I'm selling my VX and took a video of how to fix it and it working properly for the potential buyer. I'll put them up here for anyone who wants to take a look. I also have a picture of the bracket inside on window and the videos show the "washer fix" the moves the lower part of the track outwards, giving a better angle for the window to ride up. Also, I took pliers and widened the front track frame, greatly reducing the drag of the front edge on the window. I encourage you to take a look at the videos. It may help. Maybe it won't, but it sure can't hurt!

The problem:
http://s1270.photobucket.com/albums/...-40-38_928.mp4

The fix:
http://s1270.photobucket.com/albums/...-01-18_387.mp4

Solved!:
http://s1270.photobucket.com/albums/...-15-52_839.mp4