While working I will get a Dialogue Box " Attempted an unsupported opertion". Then I have to close Revit throught the Task Manager.
Do you have the latest service pack installed?
What are you trying to do?
you can find it under help - in the upper right corner - the down arrow next the question mark - go to about. The image below will show you mine - with the update.
Access a broad range of knowledge to help get the most out of your products and services.