1D-X 1.2.1 firmware is available
That sure is an odd FW update. It looks like the only thing it does is disable the Card-Select / Image-size button on the rear to prevent accidentally changing it. Of all the settings that are possible to change accidentally, this sure didn't seem like one of them. It's odd that someone felt it so important as to release a dedicated FW update.
|Hook Head Lighthouse by kroker|
from Best Photo of the Week
|Green turtle in the shallows by gcachon|