I've been using CHDK for quite a few months with my Canon Powershot SX40HS and I just now noticed that the DNG format has not showed up in my downloads to my Shotwell program in Linux.
I also noticed that the suffix "dng" no longer shows up on my camera's LCD display window. The camera still indicates that chdk autoboots though, showing the chdk version. Thyen I click the camera "alt" button, as I always have, and the camera shoots pics as always, but now only in JPG. When I go into the "alt" menu, it indicates dng is "disabled".
I have a feeling I may have hit a combination of buttons incorrectly to cause this problem.
The chdk version is 1.1.0-2182
revision 0
Sept 29 2012
FW vers 100i
Compiler GCC 4.4.3