Can you do the following?
- Close everything.
- Launch Revit.
- Start a new project.
- Launch Dynamo.
- Open the collapsing nodes graph.
- Close Dynamo.
- Close Revit.
- Post your Dynamo log. Info on how to locate them can be found here: Locating the log file - #2 by Alban_de_Chasteigner
- Post your Revit journal. Info on how to locate journals can be found here: About Journal Files. Note that you may need to adjust the path based on your Revit version.