Unfortunately that is entirely correct; there is nothing wrong with your camera. On page 120 of the manual (download address below) it states: "This camera has been tested with memory cards through 2 GB. All memory card functions cannot be guaranteed." When the A620 was developed and released back in 2005/2006 there were no 4GB cards so it was never designed for nor tested for them. All you can do is stick to 2GB cards. Even if the camera could take them you'd see a real performance drop as there are few SD compliant cameras of that design period which work satisfactorily at the maximum 4GB capacity. The camera is no longer supported by Canon and no firmware has ever been released to remedy the situation. Sorry this is not the answer you were hoping for but I hope that it's been of assistance. Please return the favour by rating my answer. http://files.canon-europe.com/files/soft25437/manual/A620_A610_ADVCUG_EN.pdf