Hello & welcome, Thomas !
Hi all, Searched the forum to no avail. Have loaded CHDK on my canon SD1000. Works fine. Original firmware was the 0.2 and loaded build 0.2a, Updated firmware etc. Goes into ALT mode just fine and works fine except I cannot seem to get the program to remember any of my custom user settings in the OSD and other menu lists. Your advice is appreciated.
Leave <Alt> mode before you power-off the camera...
Maybe also the card's filesystem is corrupted - backup your photos, format the card & re-install the latest CHDK version.