Hi, Martin
I’m new to this forum, but have been following other forums for the EX and your thread caught my eye so I had to join up.
I had this exact same thing happen, but not with a SxS card. I was using a MxR Express Card adapter with a Transcend 16GB class 6 SDHC card. I have 6 of these cards, 2 SxS 16GB and 2 SxS 8GB. I have never had a problem with any of my other cards, either SDHC or SxS. I posted on another forum about this, but no one there had experienced it. Fortunately for me, my take wasn’t a critical one so I didn’t bother to try the SDI out option. My clip would also play back in the camera, and actually downloaded to the drive via Clip Browser, but would not transfer with File Transfer. I got that same error message and grayed out clip. Have you noticed if that clip plays in Clip Browser?
I did try to copy the clip back to another SxS card which failed. Now I wonder if I have a problem with that one card. (no big deal, they only cost $30) I have also heard that the best way to erase the cards is not to format it every time (but there are those who still swear by this) but to use the ‘all clips delete’ function in the camera’s menu. This is what I have always done, and with the exception of that one clip have never had a problem.