Have a Cannon A700 and activated the autostart from the Script. My camera is now locked out of doing anything when the software is on. No matter what buttons I push nothing changes, I simply have the Cannon start up screen. When the camera is turned off the lens retracts and then reopens and it does this repeatedly. Really could use some help in as I like the program.
Press the shutter release button to halt a running script. Then change the autostart option in the menu to "off" or change the script or do whatever you need to do.
Update : if that fails, pull the SD card out of your camera and use an SD card reader to delete the CCHDK.CFG file from the CHDK directory on your SD card. Put the card back into your camera and you will be back to the original state when you first installed CHDK.