I took a bunch of pictures this weekend and reviewed some of them on my camera with the memory card in it. Last night I put the memory card in my laptop to upload the pictures and only the older pictures I took were there, nothing new from the weekend. I put the card back in my camera and I could no longer review them there either. Is it possible the card was full, but allowed me to take pictures anyway? If this is correct, why was I able to review them on my camera until I took the card out to upload them? Help! Thanks.