SX500IS, CHDK is loaded, HDR.Bas is the script, not in ALT mode. How do I review the photos on the camera screen? Normally the camera should power on in the play back mode and half press the shoot button should change it to shooting mode. But since CHDK has assigned the play back button to ALT toggle button,it no longer shows allows viewing the photos. I have not been able to figure out what change in settings have I made that I no longer can turn the play back on. After I take a photo, that photos does remain on screen for a second or so but then it goes to shoot mode.