After opening the Material Editor the scene will no longer render. Nothing is happening when I press the render button (I still get the v-ray rendersettings dialog). If I open the file again and hit render without opening the ME, it renders fine. The slots in the ME is not updating/showing properly either, so perhaps a ME problem…?
In the process of exporting the objects over to a new file (lots of opening and closing), the ME started to update itself again… and then the rendering also worked again… Hm…