17.5 composition marker shortcuts don't seem to work anymore
shift + 1, 2,3, etc does not add composition markers and hitting the numeric keys does not navigate playhead to numbered d markers
This is new behavior in After Effects 17.5. The new camera navigation tools and 3D transform widget modes now use the 1-6 keys.
You can restore the old behavior by disabling the “Use 1/2/3 for navigation and 4/5/6 for transform gizmos” option in Preferences > 3D.