CF card glitch/can't read

I have imported 2 of my 3 CF cards with no problems into my computer (via iPhoto). My 3rd CF card is full to capacity and I can view the images on my camera but my computer/iPhoto says there are, "no images to import." In other words, my images are stuck on my CF card.

Any ideas how I can remedy this??

I formatted each CF card before taking the first picture.

Any help is greatly appreciated.


Thank you,
K.