I too have seen this behavior on my Canon Powershot SX 130 IS on two separate occasions. In both cases, I discovered that at least one photo had been corrupted to the point where neither the camera nor my computer recognized it as a valid JPEG image, and other nearby images were mangled. I suspected faults in the SD card, but scanning the card from Windows Explorer (with the "scan for bad sectors" box checked) didn't turn up any problems, so I'm no longer convinced that the camera itself isn't to blame. But I don't have any more information to give, just confirmation that this issue has happened more than once, on more than one SX130IS.