Revit freezes when opening dynamo R23

[crapai]

Revit is freezing when I try to open dynamo in R23. I've already tried moving all add-in and packages to temp folders to test if there is a conflict. Still freezes. No error message because it never ends. Are there any other steps I should be trying?

[L.Maas]

Can you check your last jounal file to see if something is mentioned in there?
-Look for upgrades to Revit
-Do you have additional packages installed for Dynamo?
-You might also try to to fix .net (look for .NET Framework Repair Tool)