Please does anyone have information about using 256MB SD cards in the Canon Powershot A520? I have tried two unused Sandisk 256 SD cards in my brand new A520. Formatted them in the camera, both immediately gave problems. They record images OK, but next time I switch the camera on it says "No Image" and I cannot view them. I take one shot, and they reappear - until next time I switch on again. Also, I cannot download images from these cards through my card reader onto my PC. All I get is blanks where the pix should be. Also, it often throws up "Memory Card Error" when trying to shoot. Re-formatting makes no difference to any of these problems. All of this means that I cannot download or print any images. Another guy also with a brand new A520 is having similar problems with Sandisk 256MB cards (bought from the same source). The card dealer says he has sold 200 from this batch with no other complaints and says "Sounds to me like a compatability issue." I may be unfair to Sandisk, perhaps this happens with all 256MB cards. (The Canon 16MB card supplied with the camera works perfectly.) I would like to hear whether anyone else uses 256MB SD cards (especially Sandisk) in the A520 - or what other card should I be using? Please help this frustrated novice!