I just had this problem for the first time in ten years of owning my car. The rear passenger window went down and then the grinding sound and it wouldn't go up. Took the panel off and the cable was broken & tangled. Since it was Sunday, the only place I could find a new regulator was at NAPA. I put it in and it works perfectly. It might not be as good as OEM and is made in Taiwan, but the guy said it has a limited lifetime warranty so as long as I own the car, they'll replace the part for free.
One problem I did have was getting the switch out of the door handle. When I got it out it came out in pieces. I was able to put it back together again and it works, so all is well.