Snapmaker Luban only with white screen after re-installation

Since the installation on Snapmaker Luban 3.15. the app starts and the pull down menu is also selectable, but the content of the app always remains white, no matter what I do. I cleaned up the registry and installed the previous version, but it behaves the same way.
My OS is Windows 10 Pro with 16 Gb RAM.
Does anyone know about this problem?