I believe this might be a duplicate of #944228. The description there contains valuable input on how to reproduce the issue. I was able to reproduce it as follows:
- open up multiple gnome terminals - tap the icon twice, the expose effect will be triggered - after the expose effect, the panel won't hide anymore unity-2d: Installed: 5.8.0-0ubuntu1 Candidate: 5.8.0-0ubuntu1 Version table: *** 5.8.0-0ubuntu1 0 500 http://us.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages 100 /var/lib/dpkg/status unity-2d-panel: Installed: 5.8.0-0ubuntu1 Candidate: 5.8.0-0ubuntu1 Version table: *** 5.8.0-0ubuntu1 0 500 http://us.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages 100 /var/lib/dpkg/status --- unity: Installed: 5.8.0-0ubuntu2 Candidate: 5.8.0-0ubuntu2 Version table: *** 5.8.0-0ubuntu2 0 500 http://us.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages 100 /var/lib/dpkg/status ** Changed in: unity Status: Incomplete => Confirmed ** Changed in: unity (Ubuntu) Status: Incomplete => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/929167 Title: Ubuntu 12.04 unstable: Left-side launch panel has stopped auto-hiding To manage notifications about this bug go to: https://bugs.launchpad.net/unity/+bug/929167/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs