Why doesn't the Libreoffice icon appear on my launcher when running?

When we run an application, its icon would appear on the launcher and so we can call it back after minimize it. Specially, a little triangle would keep appearing near the icon, meaning this application is running now.

However, when I open a Libreoffice file, the revelance icon doesn't appear on the launcher! What's more, when I minimize Libreoffice, I couldn't find it even through "Alt+Tab". I've tried Libreoffice 3.4 and 3.3, but the problem exists all the same.

Look, here is Libreoffice Calc running, and no icon appears on the launcher. If I minimize it, it is impossible to call it back.

Solution 1:

You can use Super+W to show all the windows on your desktop. The LibreCalc window will appear there.

(The Super key is often the Windows logo).

There is a problem, but this is a work-around.

Solution 2:

Logout, then log back in again using Unity 2D, then log back out and back in with 3D. Your problem should be solved.

Theories as to why it does this include.

• Unity 2D launcher config overwrote the Unity 3D config, thus "fixing" the configuration files.

• Unity 3D was having a bad day and needed a break.