I have found a temporary solution. I had to reinstall the ML software on the SD card I was using. This still doesn't answer why I had the problem. Nothing else I tried such as removing the battery, etc. worked.
The camera also won't work with another SD card with ML installed on it. So maybe I need to un-install everything and start from scratch.
The camera also won't work with another SD card with ML installed on it. So maybe I need to un-install everything and start from scratch.