Seems to be an 3D rendering problem of the radeon driver since it affects Mint(Debian Edition as well as Ubuntu based) Cinnamon too.
** Also affects: debian 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/751828 Title: Corrupt (stripes) panel shadow texture To manage notifications about this bug go to: https://bugs.launchpad.net/unity/+bug/751828/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs