It's a common problem on the G12. Had mine repaired twice and it kept happening. I eventually got referred to this place: www.camerasandparts.com It was $89 through them including all of the service they do on the camera, both parts and the labor were included. Best part, they just service Canon Powershot's and they are completely familiar with this image problem on the G12. They actually do a correction inside the camera so this won't keep happening. I have to say, it's worked flawlessly ever since. The previous repairs I did were through another place and the problem happened again. Cameras And Parts explained the correction they do with all the G12's they service. Very impressive. Repair time was just a few days too which was nice. All in all, the best place to fix and correct this common problem.