So I have been using my 5d mk III for months with my file names renamed as such "EOP_XXXX" about 2 weeks ago seemingly out of nowhere the files began being written as "_OP_XXXX" I went back to file naming and verified it didn't change. I reset "user setting 2" to be "EOP_pic size" and it still comes up as "_OP_pic size". WHAT THE CRAP!
Has anyone noticed a problem like this? Is my camera resenting the "E"? This is really starting to annoy me.