@ Stewpid,
Thought you'd be interested in my findings today.
I decided to call the chap that wants me to edit footage from his XF100 this weekend, and explained it was extremely important we try nudge these problems out before Sunday.
Anyhow he popped around today and brought his camera again. I plugged the cable in, opened FCPX, and yet again I was unable to read the files on the CF Card. I took the cards out, inserted one of my own, formated it and shot a 10sec test shot. We'll what do you know, after opening FCPX, the file came straight up.
I thought we'll let me see how the tree structure looks in finder. I noticed the main folder was called CONTENTS, then CLIPS, then the individual files inside.
I when back to his cards and noticed the CONTENTS folder was missing. I asked him, is there any change someone played with the files on this card, he turns and answers, oh yeah I decided to rename the folder to keep track of the job that was on the card..!
YEP..and there you have it, EVERYONE calls themselves a professional
Also the other thing I found was bringing the files in from FCPX kept the files as 1920x1080 50i, but attempting to convert them using the XfcpX2 app, changed the files from interlaced to progressive... VERY INTERESTING!