Dynamo Player - Elements are Disappearing after the Next run

[pyXam]

I agreee with Jamie,

This sounds like element binding, which is a great feature if you know it exists and how to use it. Otherwise its just confusing and heartbreaking…

Jacob did a really good post about it here;

Element Binding in Revit

Element binding is the name given to the process which Dynamo manage to ‘track’ the items created in non-Dynamo files. In this case, I’m going to focus entirely on element binding as it refers to Dynamo for Revit, but the mechanism exists to allow for this behavior in other applications (advanced steel, fusion, alias, etc.) as well. In the context of Revit, ‘elements’ refers to anything with an Element ID in the Revit database. When utilized correctly, element binding will expand how you leverag…