I've just bought a Sandisk Extreme Pro 32Gb CF-card for my 1DmkIV but the card doesn't work in the camera. I just get the message "no card" when I put it in. The camera has firmware 1.1.4 so it should work with the new UDMA7 cards. I tested the card in my 5DmkII and it worked just fine with that camera. What can be the problem???