I'm trying to get CHDK on my SD450 (1.00b) using a Macintosh with a SanDisk card reader. I've downloaded the corresponding allbest version of CHDK. I unzipped it with Stuffit Expander. I couldn't find any equivalent to Card Tricks for Macintosh so I just copied the files over directly to the card. Locked it. Put it in camera, turned it on but camera just tells me that the card is locked. What am I missing here. I didn't have Card Tricks so is there some other way to make the card autoload? Thanks!