Often it is cause as it is off the screen so disconnecting all external monitors usually does the trick, but also have a look at this Knowledge Base Article as it was released only a few days ago
Material Browser does not launch when accessed through Revit
Jay Colcombe
Autodesk Certified Instructor
Revit Architecture & Structure Certified Professional
AutoCAD Certified Professional
B.Sc. Hons Civil & Structural Engineering
If you find my post interesting, feel free to give a Kudo.
If it solves your problem, please click Accept to enhance the Forum.
