After installing additional RPM packages through Yast2, VirtualBox doesn’t start anymore. When you reinstall or force install VirtualBox everything is OK again. This error is due setting permissions, after run SuSEconfig, of VirtualBox directories in /etc/permissions.easy file and setting some libraries and executables for VirtualBox to root:virtboxuser and permission set to 4700. When you set permissions in /etc/sysconfig/security from set to warn then permsissions will not be changed automaticaly.