Same thing happens with linux mint 17.2, didn't happen in 17.1 however. The line across the screen is only there when running plank or docky. Line goes through all open windows as well, definitely a bug. This occured immediatly after upgrading from Mint 17.1 to Mint 17.2 both with XFCE desktop.
** Also affects: ubuntu Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1455571 Title: Blank/transparent line appears above the dock and affects the entire screen To manage notifications about this bug go to: https://bugs.launchpad.net/docky/+bug/1455571/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs