Lightroom CC for desktop. The window with view of the photo is black. I cannot see the photo.After the last update the photo's only show a black screen in the development mode. In the Library, presentation and print mode I can see the photo's correctly.I'm working for 10 years with LR and since yesterday the problem occurs. I installed an older version 9.0, but the problem reamains.Does anyone know how I can solve this problem?