Update: Recently on a shoot one of my Komputerbay 64GB CF cards reported an error (it happened very fast, but I believe it stated a footer error) in camera after shooting approximately 42GB. When I attempted to ingest the card into my DIT station the card would no longer read and only appeared as a 32MB drive attached to my card reader - this could not be formatted.
I attempted to initialise the card and run deep scans with various recovery programs I own, but none could access the storage device. My assumption is that the controller has failed hence I can see a small area of storage (that can't be written to) and not the total storage of the card.
I have sent the card back to Komputerbay (return address is in Birmingham) with an RMA and expect to receive a replacement card soon - I will update when this happens. I have been in contact with KB Tech Support and they have gotten back to me on all occasions, however there is little support they can offer for an error of this nature other than replace the card once it is back with the company. On a work related note, this was not ideal as it cost me an additional half day on re-shoots which have now taken place and went smoothly (thankfully).
My other 64GB KB CF card is still working perfectly - I am now reassessing to what degree I use these cards in semi pro/professional environments.
To be updated...