While shooting on Thursday (bikes on track) I ran out of CF space (not unusual). Turned off, replaced card and turned on but the cameras still claimed the card was full. No images on the card, turning off again did not improve matters. Popping the battery out and back in again fixed it.
It did it again at the end of that card, but after that I was rather more careful to change the card before it was totally full.
Anyone else had a similar issue?
All the best