I have just purchased a pre-owned Sony FS7. I did some filming with it and noticed that the Thumbnails menu is grayed out. I get the message 'Cannot Proceed'. However, if I assign the Thumbnail function to one of the assignable buttons it work fine and I can see all the Thumbnails and play the clips. So, obviously, there doesn't seem to be any issue with the card.
I have also performed Reset All but that has made no difference. I would be grateful for any advice. Thanks.