This issue happens only in certain revit files. First, trying to acquire license for revit takes too much time (5 to 10 minutes). After acquiring license, adding materials in the asset editor is imposible, and the program crashes. I look for v-ray support, they realized that my rvt file had almost 50 000!! instances of the Fase - existente material. I dont have any idea of how I achieved that number of instances, but even when I purged unused materials and also after auditing my file, the problem persists.