I have had the C-765 since Nov. 2004 with no problems. Last Saturday we took several pictures at a party and they all showed on the camera at the party. The next day I removed the card from the camera and put it in a card reader and the pictures were not there. After putting the card back in the camera the card would just show "picture error" on the screen. The pictures were nothing valuable so I reformatted the card and now it seems to be working. Has anyone else had this problem? The cards are Olympus XD 256 MB. I am using a Sundisk card reader. I have some important events coming up (weddings etc.) and I would sure like to know if the card, camera or card reader may be defective. Any help would be greatly appreciated.