Climbing Mt Townsend - first photo - it's OK.
Part way up Mt Townsend - what's that strange pink glow in the sky?
Wind-eroded overhang - where has the sky gone???
Overhangs and boulders - pink sky AND aberrations in the saved file.
Inspection revealed that the red channel becomes pretty-much saturated under certain conditions. Curiously, Sue's blue top was largely exempt, but the brighter sky ... Oh Dear.
No, this was not totally out of the blue (pun): the camera had been suspect for a few months now, and on a couple of recent trips the pink had started to show up slightly.
I now have a new Canon G11. Different memory cards, sigh. No more replaceable e2 lithium batteries, sigh. But nice ...