In my project, new transitions suddenly appeared in orange instead of the normal yellow. Some time later, new transitions got the yellow color again.

What is the difference between those colors?

Screenshot:
http://fotos.cweiske.de/screenshots/2017-01-05%20kdenlive%20timeline%20yellow%20orange.png

This is with kdenlive 16.12.0.

I was wondering the same thing.
And found this topic with no answer here.

However i figured it out today
and it reminded me of this topic's existence so big mystery is:


Hit the button called automatic transitions on lower right portion of interface. (second from the left.)