I think I've found a bug in the S1iS's operating system. Twice now, the LCD display screwed up under the following conditions:
1. I turn on the camera.
2. As it is turning on (this take a coupla' seconds), I open and turn the LCD screen.
A different "failure" happened each time:
a. The LCD display did not illuminate, even though I pressed the Display button several time. I could only use the viewfinder.
b. The camera stayed with the boot-up image -- as if it froze. I couldn't do anything else, except turn off the camera.
I should emphasis that the bug does not occur consistenly -- just twice so far, and both times the effect differeed.