I have changed the name of my 1dx files in camera too 1dx_****, and I did that the first day I got it, it has worked a year and half alomst, but now, for some reason beyond me all my files are named simply, dx_***. I checked in camera to see if I have bumped or deleted the "1" but no, in camera it still says 1dx_****, I have tried both slots, loads of different memory cards, and when looking at the files in Finder (mac) they are named dx_**** so it isn't Lr that screws up. I deleted the name in camera and wrote it again, it stays 1dx_****, but the files themselves are STILL named dx_****
How is this possible?
**EDIT** I solved it, but leave the topic if anyone else experiences this, I had changed my color space from sRGB to AdobeRGB, and seem to be the cause. Changed it back to sRGB and it still works.
I would still like to know why, and if I can shoot AdobeRGB and still name my files what I want.