I updated my Card with the latest CHDK release (2548) and my SX260 would not start with the start button, nor the review button. I thought the battery had died and sent in for a replacement battery, since my battery was only about 2 weeks old. I put in the original battery, which came with the camera, same thing! I then Went to Bestbuy with my receipt in hand and got a new camera, same thing, again, the camera would not start up, no matter what I tried. I then swapped cards and put in a virgin card. Camera started right up, after I removed the battery for about 30 seconds and replaced it. I put the CHDK card back in with the card unlocked and I was able to use the camera normally. Afterwards, I locked the card back, inserted it into the camera and once again, the camera would not start by any means. I took the card out unlocked it, reinserted it and still nothing. I took out the battery for about 30 seconds, put it back and the camera started right up again. It seems to me that 2548 broke something as regards the status of the card when it's locked. Has anyone else experienced this?