is that the only document that fails to print ?
those lights flashing green usually just mean it is busy and/or receiving data.
It may be that there is some sort of error in the codes it is getting and it kind of gets stuck because it doesnt know what to do with it. Or it might even be that the image is too large to fit in its memory so it gets stalled.
I would try dropping the resolution down a bit and see what it does.