@Pierre
Thanks. The crash reason is an "out of memory" situation.
The bad news is: I have no idea where this comes from. The camera has more than 3MB of free heap at start (reported earlier in this thread) which does not decrease significantly in shooting mode. Then, all of a sudden - out of memory.
This has happened to me with my ixus150, and it is the reason that port isn't in autobuild yet.
I have not been able to reproduce it on my camera.
Are you using the camera manually? If so, I can prepare a special build that permanently displays the free memory on screen - this might help finding the operation that eats up the memory.