Graphs Not Working

Why would a Dynamo script which worked multiple times only 3 days ago, not work today?

Has the graph previously crashed and you’ve had to perform a forced closing of Revit/Dynamo whilst it was running?


I cannot recall if l had to previously close Dynamo down. However, I’ve managed to get it to work by dumbing down the script, getting something working, then connecting all the nodes again for it to work in totality.