I'm having the same problem. Silicon spray helped a bit, but not to my complete satisfaction. Two questions: when those out there use the silicon, how are you getting it in the tracks? With my door completely apart and using that little red straw that attaches to the spray nozzle, I could still only reach a small portion of the track. I wound up just spraying a whole bunch of it in there and hoping it would spread out by moving the window up and down a few times. My other question is about the shimming - what is this, how is it done, and is it expensive? My VX is no longer under warranty.