The same problem exists for cues etc in audio clips - that text uses the "Regions" colour.
RADO-VOX (modified):
Default:
For information:
-- cues etc in audio clips use the "Regions" colour
-- markers etc in MIDI clips use the "Markers" colour.
The problem is that the Region and Marker colours are chosen to be distinctive on a dark background but the clips colours are often light. You can do some colour juggling of the lane backgrounds and text colours but that should not be necessary.
Both should have their own colour definitions in the Theme Editor
Cry "Freedom for the metadata colours"
Vote here:
http://forum.cockos.com/project.php?issueid=4985