Node Issues with Dynamo 2.6.1 for Revit 2021

Having all sorts of issues with Dynamo for Revit 2021. This seems to be a total failure of dynamo and short of a complete re-install of Revit, I am at a loss.

First issue is that I am unable to open existing Graphs. When I hit the open button or use one of the recent files not he some page, dynamo thinks for a while, then usually pops up something that looks like this…

This seems to happen for all graphs.

If I create a new graph, able to create a code block by double-clicking, but I am not able to add any other nodes. They all cause dynamo to lock up.

So far i have updated Revit to 2021.1.3, restarted my machine, and ran a repair. Not really interested in doing a complete uninstall so i thought i would ask here before filing a support case with Autodesk Directly.

Any help would be be greatly appreciated.

This is likely a dll conflict between Dynamo or one of your packages and your Revit add-ins. The specific conflict should be listed in your Revit journal or Dynamo log. You can also review the list of issues in Dynamo by clicking the green ! icon in Dynamo’s menu.

The first thing to try quickly is disabling all Revit add-ins and confirming the issue is resolved. Then close Revit and use a binary search (add back half the add-ins, if the issue turns up than you know it is one of the ones you added back, test half of them; if the issue doesn’t persist you know it was one of the other half, test half the untested ones - this will allow you to id the problematic add-in among 128 in 7 tests) to ID which add-in is at fault.

Thank you! That appears to indeed be the issue. Now i just need to go through and figure out which one it is.

Thanks again.

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Post back once you know so others can learn. Old versions are often the route cause, so you might want to double check that they are all current as well.