shawn
Veteran
I doubt the OS would have anything to do with it too.
I tried formatting the card to a different file system (on my mac) and when I do that the camera gives an error for the card and won't take any pictures. Which makes sense since it doesn't know how to read different file systems. Formating back to FAT (on my Mac, it couldn't format in camera when a different file system) got it working in the camera again.
You might try running Disk Utility -> Repair on the drive and it will see if the file system is a little corrupted. Beyond that probably reformatting will get it running again.
I tried formatting the card to a different file system (on my mac) and when I do that the camera gives an error for the card and won't take any pictures. Which makes sense since it doesn't know how to read different file systems. Formating back to FAT (on my Mac, it couldn't format in camera when a different file system) got it working in the camera again.
You might try running Disk Utility -> Repair on the drive and it will see if the file system is a little corrupted. Beyond that probably reformatting will get it running again.