Thanks for the reply. The topic there suggests to use C mode to store needed settings (including drive mode). However this does not work. When I activate CHDK (by pressing S button) while in C1 or C2 mode, the camera leaves the C mode and goes back to the original mode I've used to dial in the settings. The drive setting then reverses to single shot. How can I force CHDK to keep the camera in C1 or C2 while active? Any other suggestions? Thanks.