Revit Crashes when i open a new template or existing file

[londonZ7F92]

Revit 2023 Crashes when I open a new template or some existing files... for example the sample file opens fine.

I've done an clean uninstall, but the problem is not solved.

Apparently also a previous version 2021 that I have is with the same problem. Screenshots are attached 

[ToanDN]

Follow these steps to resolve the issue: 

1. Close all Revit Sessions on the affected machine. 
2. Rename the following file (instead of removing the folders listed in the solution below): C:\Users\%USERNAME%\AppData\Local\Autodesk\Revit\Autodesk Revit %VERSION%\DDGraph
3. Restart Revit. 

Alternatively: 
Copy and paste a healthy DDGraph file from another machine, where the issue is not reproducible.

If the above steps do not help, clear the content of the following folders:

• C:\Users\%USERNAME%\AppData\Roaming\Autodesk\Revit\Autodesk Revit %VERSION%
• C:\Users\%USERNAME%\AppData\Local\Autodesk\Revit\Autodesk Revit %VERSION%

%USERNAME% should be your windows login name.

%VERSION% should be your Revit version.

[londonZ7F92 · Accepted solution]

Unfortunately it doesn't work.
I found the problem. It is because of the latest updates from Speckle. I
downgraded Speckle to 2.7.2 and the problem disappeared
thanks