My brother has just bought a Pioneer DVR 5100HS. Although the player/recorder works fine, he's having trouble with the photoviewer. All his images are transferred from PC to CD-R but the Pioneer will only play selected images. The unplayable thumbnails are shown as a triangle with an exclamation mark and it just says "Cannot play this image". I've tried one of my photo discs and get the same problem on his machine. Is this a setup issue or, perhaps, a faulty unit.