Sorry that after starting this thread I didn't chime in again until now.
Here is what's happening:
After a day of shooting I start reviewing some of the images I've taken
in the camera's viewer. One shot (out of hundreds) will show as not
readable, or something like that. When I plug the SD card directly into
my computer, I find that there has been a filename created
(imgp4432.jpg, for example), but it has a zero-byte length; no data stored.
This has happened at least once on all three of my cards. Two of my
cards are SanDisk. One is Dane-Electric. Two are 1gb, one is 512mb.
So there seems to be no common thread among the cards.
As I mentioned before, I do sometimes turn the camera off immediately
after snapping a shot. Others have mentioned that the card access light
does continue flickering after turning the camera off, while saving
images. I confirm this. I have no doubt that when I turn the camera
off it continues saving images... at least most of the time.
But somehow I am getting one out of about 300 images stored as a
zero-byte file. I don't know the particular set of circumstances that
have led to this event. My question is, have others experienced this
behavior with their *ist-DS, and if so, have you figured out what's
causing it?
Dave