I've got the strange problem that the contrast (or gamma) of clips change visibly whenever they are transitioned.
A single frame before the transition (wipe or dissolve), the clip video image is normal.
The next frame (that is the first frame in the transition) has different contrast applied.

Unfortunately, this is also visible in the rendered video.

Screenshot with both states: http://hidden.cweiske.de/kdenlive-wipe-contrastproblem.jpg

This happens with kdenlive 16.12.0.

What could that be? What can I do to get this issue fixed?