When you minimize a window to the launcher, it remains with the focus, meaning that, for example, the global menu is the menu of the now minimized window.
The focus should automatically go to the window immediately underneath it or, if no other window is open, to the desktop.
It is particularly confusing when you minimize a window and then go to the global menu, expecting it to be the menu of the window being displayed on top now, but instead is the menu of the app you just minimized.
Note another side effect:
1. minimize a window like thunderbird (only one instance opened)
2. click on the launcher to show it again
-> you can't restore it as it's focused
DistroRelease: Ubuntu 11.10
Package: unity 4.18.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-11.18-generic 3.0.4
Uname: Linux 3.0.0-11-generic x86_64
Date: Mon Sep 26 15:25:04 2011
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta amd64 (20110921.2)
UpgradeStatus: No upgrade log present (probably fresh install)