Thank you soooo much for this post. I have had this card for 5 years and it had never been locked 'til this past summer.
I should have researched and found your post eariler.
Just last week I gave up on trying to figure out the camera settings that “caused” (or so I thought) the error and bought a 4 GB Sandish Ultra 15MB/S SDHC and now it too has the same problem. However moving the switch on the card has not changed the card error message. :(
Any ideas?
