My understanding is that the camera will go to the HIGHEST common denominator (or whatever you call it).
If you take 10 pics on one card then switch to another new card then it will continue from #11. If you shoot from 11 - 20 on card #2 then put the first card back in (with pics 1-10 on it) it will continue from #21.
However, if the new card already has a picture number 27 on it then the camera will say "oops I guess I should be up there" and go from 28 on.
Originally posted by peted I did not see this problem on my DS when I have flashed the firmware, always kept correct numbering.
In the situation quoted above, did you still have pictures on your card? this would explain why it continued with the correct numbering.
Just my thoughts gleaned from others' posts during the whole "firmware upgrade" craze.