The problem isn't the plasmoid itself. When you try to enable the desktop effect, the xserver itself crashes, most likely due to a bug in the drivers. If enabling the desktop effects still causes you to return to the login screen, could you attach a copy of /var/log/Xorg.0.log.old?
-- KDE 4 session had closed, after Turning Desktop Effects OFF https://bugs.launchpad.net/bugs/296685 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs