By Dennis Collin
With the recent release of Revit 2020 and LT 2020 some customers have reported issues in which Revit runs in Viewer Mode unexpectedly, without displaying the usual Viewer Mode warning dialog. This results in users being unable to save, export or publish modified projects.
An update which fixes this has been made available on the Desktop Application or the Autodesk account portal, which addresses this problem.
After a successful update the Revit build number should display as 20190412_1200.