I have an M80 that I received for Christmas. I've had no problem with the cards, but have seen posts of such. I purchased several new cards and have not had a problem viewing in my digital camera. If I recall correctly the problem occurs with high speed cards. Also if the card has been used or formatted in another device you may have problems. Purchase new standard SDHC and only write to it with the camera. Only use other devices such as camera or laptop to read the card, never write or format in another device and you should be fine. Also check the firmware version on the camera, there were updates for trigger speed. Update info is on their website.