Two screenshots are better than one... A theory: I suspect the problem here is unity-window-decorator. It's designed to expect unity itself to draw the panel shadow (unityshell.cpp?), but in Ubuntu Classic mode compiz expects the traditional compiz window decorator to draw the panel shadow, but the unity-window-decorator doesn't (??)
** Attachment added: "Screenshot.png" https://bugs.launchpad.net/ubuntu/+source/unity/+bug/731685/+attachment/2160213/+files/Screenshot.png -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/731685 Title: Panel shadow conflicts with Window shadow in Ubuntu Classic Desktop Session -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs