Which DNG version have you selected?
Version 1.3 works only with newer Adobe products like Lightroom.
Version 1.1 is the better version vor other programs.
Choose the version 1.1 in the RAW/DNG menu. CHDK will prompt you to create the file badpixel.bin. You find a menu entry for that in the same menu.
'super fine' does not work for the SX220. There is issue with the memory management.