I checked your automatic locker with my frm viewer, and it is missing some data, like the frames per second to animate. (The fps for other locker animations is 10) There are no offset values as well, but as I checked the other lockers, the first frame was at 0, 0, and since your's does not change image size/move it's not required.
In the next version of the frm viewer, I will add an option to edit and create new fallout frm files with the default palette, maybe you will find it useful.