SOLVED (oversight): Bug when adding Grade or Colorcorrect node screen goes black

Software Natron
1

I have this weird problem, that when I add a Grade or Colorcorrect node it turns the viewer black.
Even when I add it all the way at the end to do a final grade.

I a running on MacOSX High Sierra, Natron version 2.3.14 Release.

See images of the problem.

05
052880×1800 1.26 MB
14
142880×1800 1.03 MB
25
252880×1800 1.01 MB
35
352880×1800 1010 KB

2

STUPID ME! The node had a (un)premult switch on at default.