Shooting onto a UDMA cabable CF card such as the Sandisk Extreme IV and then inserting a DMA CF card such as the Sandisk Extreme III which already contains images will lead to loss of images on the DMA card. After a few captures the back will start beeping and the LED will flash and all images on the DMA card will be deleted.
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So thats why the camera locked up with a "lens error", the card froze, and all my (only 6 thank god) images got deleted on a freezing shoot a couple of months back... I just could not figure out what I had done wrong.
Thanks for the tip, this would have showed up again for me, with more images lost! (Thankfully i now shoot mostly to an IB, so less likely, but i sometimes use CF for convenience.)
-axel