Just wanted to add that I too have this bug however I have one thing extra that is not apparent in the video above. When I click the option in settings to enable Autohide the bar disappears but leaves a background behind. I have added a screenshot of this. As you can see when I drag a window into the area where the bar appears it is sent behind where the hidden launcher is usually displayed.
Ubuntu 12.10 fully patched. Also was happening before installing any updates. Virtual Box: 4.2.6 Windows 7 x64 ** Attachment added: "Ubuntu.png" https://bugs.launchpad.net/unity/+bug/971018/+attachment/3479320/+files/Ubuntu.png -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/971018 Title: Auto-hide Unity Launcher will not reveal when mouse pushed to left side in VirtualBox or VMware To manage notifications about this bug go to: https://bugs.launchpad.net/unity/+bug/971018/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
