Yea I had to replace the motor and regulator on my car (2002 Convertible). I discovered that the window glass has come loose from the channels it sits in. Ford used some sort of silicone to hold the glass in place. I was able to get the glass back into the channels but the front most one will not stay on (runs inside the front most vertical channel). I did not have any adhesive on hand, so I put everything together so I could at least raise and lower the window but it moves front to back like yours. I did in the mean time order window glass adhesive and later on this year, when close to time to park for winter, I will again tear apart the door and properly adhere the glass into the channels and then will have it fixed properly.