Here is some information regarding a false "graph wipe." The circumstances that this occurred under are different from the other graph wipes, and it was not triggered by an undo, and the data was NOT actually deleted. Just appeared to be.
I had a state graph with two super states (not linked). I pressed the "Home" key to recenter my view, and everything disappeared. No error in the console, or stack trace generated.
It's like it's lost where the nodes are, and pressing home or overview goes to the wrong spot. Scroll enough and you can find the graph again, though:
I haven't been able to trigger this on any other graph, and I don't know reproduction steps. However, I'm posting this in the event that it happens again and we can begin to figure out the exact trigger.
Customer support service by UserEcho