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is this shot on a normal tripod?
50 seconds on a normal tripod would show significant star trailing, Malc.
Can you see trailing like blobby stars with a streak in the original photo?
I don't know CHDK - but it doesn't seem to keep the shutter open as long as you told it to.
I don't understand enough but I assume the chip in your camera is damaged in that part.
DSS could potentially help. ... try using DSS (Deep Sky Stacker) and stack one photo with darks and flats while setting the exposure time to those dubious 50 seconds, again. Maybe DSS can get rid of the light area?
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