When a track is in a folder track and no color selection has been made for said track its color by default is grey. But you can choose a color for the folder track and all the regions on tracks inside that folder track turn color!
Great time saver… accept the tracks themselves don’t change color… in the mixer view all tracks are grey even though their regions may be colorized by the folders they are in…
Not such a good time saver now that I have to go select a color for each track anyway just so I can distinguish tracks in the mixer view.
Let me know if there is a pref that changes this folder region color behavior.