We took pics at a softball tournament and they show on the camera, EOS XT. However, when we got home and out the card in the reader, there was nothing on the card. Thinking we may have hit a wrong button, we simply put a new card in and set the other aside until we could diagnose what happened. Now, the 2nd card did the same thing? Any suggestions are appreciated. We have used the camera for about 4 months and have had great pics. All of the sudden issues with 2 different cards.

