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Roger, I have the mighty Canon A75 which did something similar a few years ago:
 Here is the shot right before, which happened to be on the maiden voyage for my new contrail:

Turns out there is faulty wiring to the CCD in many older Canon models, which is aggravated by high heat/humidity. If this is the case your camera is under recall and Canon will fix it for free, incl. shipping, as they did for me (at least it's free if you live in the US...): http://www.usa.canon.com/consumer/controller?act=PgComSmModDisplayAct&fcategoryid=225&modelid=13390&keycode=2112&id=29819
Best of luck, Dan
Edited by danbell on 02/25/2010 16:57:43 MST.
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