I did import a project I made years ago.
The parts are red coloured and I cannot change the colour.
I only can change the track colour.
Not the biggest issue, but it would be nice to know!
Thanks! 
Aloha B and +1
I too would like to know about this issue.
{ā-ā}
I had this problem a while back.
(Not sure if the link works, Iām on my iPhone right now)