Revit began just not opening, it would get to the splash screen and just close, with no errors or anything. I completely uninstalled all versions of Revit following all the instructions from Autodesk to get a clean uninstall. Reinstalled it and still wouldn’t work, after uninstalling pyRevit it began to work again, and so I tried to install it again this morning, and same thing. Uninstall pyRevit and Revit works again. This was happening in all years of Revit.