Hi Daniele,
Hope you are having a great week!
While working with the new 4.0.2 release, we noticed a UI regression specifically inside the Node Editor. The drag-and-drop functionality for positioning elements seems to be completely broken.
The Issue: When we insert elements into the Node Editor screen, they are stuck in their original created positions.
- When hovering over an element, the “move” cursor (the four-way arrows) appears correctly.
- However, clicking and dragging the element does absolutely nothing; the node won’t move.
- If we click outside the element and drag, the entire canvas pans normally, but the individual elements remain locked in place.
This positioning feature worked perfectly back in the v3.x branch.
To make it easier for you to see exactly what is happening, I recorded a quick screencast showing the behavior: 
Video: BUG Node Editor - Bricksforge
It feels like a JavaScript event listener for the drag action might have been detached or there is a layer overlay issue in the new v4 UI.
Let me know if you need me to test any hotfixes!
Best regards,
Jayron Castro
CEO, Kstros.com