Major X issue - Two desktop session open - Cannot switch

Hello, I have a major issue with the latest updates. I cannot have two desktop sessions open. Until I updated yesterday, I would run two sessions using sddm and switching sessions. I cannot do this now. If I create a new session, it doesn't close the programs, it removes them from the desktop though. If Firefox is open, I will change sessions and the first session Firefox is still running but nothing in the dialogs on any screen. I have to open an terminal and kill it to start again. Now, if I go back to the first session, the second session dies. It doesn't exist anymore. Applications are still running but no desktop. In both sessions I have .xsession-errors shader compilation failed: "" QOpenGLShaderProgram::uniformLocation( qt_Matrix ): shader program is not linked QOpenGLShaderProgram::uniformLocation( opacity ): shader program is not linked QOpenGLShaderProgram: could not create shader program QOpenGLShader: could not create shader QOpenGLShader: could not create shader shader compilation failed: "" QOpenGLShaderProgram::uniformLocation( matrix ): shader program is not linked QOpenGLShaderProgram::uniformLocation( color ): shader program is not linked QOpenGLShaderProgram::uniformLocation( textureScale ): shader program is not linked QOpenGLShaderProgram::uniformLocation( dpr ): shader program is not linked QOpenGLShaderProgram: could not create shader program QOpenGLShader: could not create shader QOpenGLShader: could not create shader I am using the rpmfusion version of nVidia driver as I need the features of my card that are not supported with the open source driver. In the past I have had to delete my .kde and other config files to get KDE to work properly again. Do I have to do that now? Was there some configuration file location changes again? As this machine is used by two people, I need to have two sessions running. Robin