I was in the process of dragging wires from the highlighted (green) List Item output to the orange List Item when something weird and terrible happened. A strange rip shape appeared, my canvas went dark and all Grasshopper previews in Rhino disappeared! I can still work on the canvas but how do I get rid of that rip shape and dark canvas and restore previews?
P.S. I found a solution:
- CTRL-A to select all components.
- File | New Document
- Edit | Paste in Place
How very strange…