Operating system: Windows 10 pro
Graphics card: GTX 1060
Blender 2.80, a205493426b, blender2.8, 2018-11-28, as found on the splash screen)
Short description of error
When I cut the line connecting one node to another, the knife does not appear, unless I start the selection inside some node ... if I start the selection in the area outside the nodes, only a selection box appears that does not have use direct, when one is with the ctrl clicked to cut the line of knots.