I noticed yesterday while shooting pictures of a house on fire and changed out my CF card that it is possible to insert the card only half way down into the slot and have the memory card door close. What I found out was that it shows up as if the card is half empty (i.e. half as many frames avialable from the start). Also the card still functions. I opened the door up and reinerted that card and it went back to normal.
style="BACKGROUND-COLOR: #000000"Anyway only lost 2 or 3 pictures while figuring this out. Rarely do i changememory cards but I had a full days of rope rescue class photos on the piramry card that I didn;t get a change to unload first.