Canon EOS 6D Instruction Manual page 365

Display Problems
The menu screen shows few tabs and options.
In Basic Zone modes, certain tabs and menu options are not
displayed. Set a Creative Zone mode (p.51).
The file name's first character is an underscore ("_").
Set the color space to sRGB. If Adobe RGB is set, the first
character will be an underscore (p.140).
The file numbering does not start from 0001.
If the card already contains recorded images, the image number
may not start from 0001 (p.136).
The shooting date and time displayed is incorrect.
Make sure the correct date and time has been set (p.36).
Check the time zone and daylight savings time settings (p.36, 37).
The date and time is not in the picture.
The shooting date and time does not appear in the picture. The
date and time is instead recorded in the image data as shooting
information. When printing, you can imprint the date and time in
the picture by using the date and time recorded in the shooting
information (p.291, 295).
[###] is displayed.
If the card has recorded a number of images greater than the
camera can display, [###] will be displayed (p.248).
Troubleshooting Guide
365