This looks kind of similar to the bug that @Darren talks about in the video below (at 30:44). Try this: Disconnect your "CONSIGNES" terminal from the type def, delete the property node, re-connect the terminal to the type def, and then re-create the property node... does that help?
This is the run screen of our cnc plasma cutting machine. Featuring G code and DXF import along with generic shape templates, the software drives an external 8 axis motion controller via activeX. A webcam option also follows drawn lines and converts them into dxf files. The machines range from 1 m x 1 m to 6 m x 30 m and make anything from brackets to aircraft carriers. All written in Labview.