Had some problems lately with the outer toll booth window seals leaking. As I am in the process of redoing them, I found a bolt to my drivers window track extremely loose. I tightened it up and put the window up, sure enough it hopped off the track. Did some reading on the DML and didn't turn up much except one mention of the bracket sliding. Decided to pull the window to investigate further.

Pulling the window isn't that difficult, you need to remove the upper door panel and the black bracket that pushes against the window and has the felt strip. This allows the window when pushed up to slide inside the car rather than into its channel. Put the window halfway down, unbolt the window motor piece from the window (its the tubular center area with two nuts holding it in). Wiggle the bracket out, and now the window is free. Pull it up and keep working the window until you get it out.

Now the window is attached to the metal bracket which has the sliders on it that fit into the track by a slightly adhesive rubber substance. I believe that its purpose is meant more as a pressurized attachment than it is an adhesive attachment. I looked and sure enough, there are dimples in the glass that alert you to where the track should be, and mine was about 1/4" to 3/8" pushed back. This means that when the window is going up, the front hits the channel first and then the motor has to push harder to get the window to 'slide' backwards into place. This force pops the front of the window off the track. My previous owner must have had this happen and as a fix loosened the track so it flexed backwards also.

Here are some pics of the window out, as well as a closeup where you can see the round dimple in the window. There is one at the front and the back when the metal bracket is lined up properly.