New Nautilus instance from Unity Launcher

[Elbarbudo]

Nautilus is the ONLY application to behave this way :

1-Open an application
2-Minimize the window
   There is a small mark in the launcher application's icon
3-Click on the launcher application's icon :
    The current application window pop up

BUT With Nautilus, on step 3, a NEW Nautilus windows appears. ( and 2 small marks on launcher)

That is NOT a normal behavior

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: nautilus 1:3.10.1-0ubuntu9.1
ProcVersionSignature: Ubuntu 3.13.0-24.47-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
CurrentDesktop: Unity
Date: Tue May 27 08:52:12 2014
GsettingsChanges:
 b'org.gnome.nautilus.list-view' b'default-visible-columns' b"['name', 'size', 'type', 'date_modified', 'owner', 'group', 'permissions']"
 b'org.gnome.nautilus.list-view' b'default-column-order' b"['name', 'size', 'type', 'date_modified', 'date_accessed', 'owner', 'group', 'permissions', 'mime_type', 'where']"
InstallationDate: Installed on 2014-05-24 (2 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
SourcePackage: nautilus
UpgradeStatus: No upgrade log present (probably fresh install)

[Elbarbudo (patricearnal)]

Very strange : apparently, as far as the nautilus window points to a "local" directory, it behavior is normal :
Minimize in the launcher and maximize to the original window.

By local, I mean the home subtree and disk

BUT when I open a mounted directory such as /media/patrice/Multimedia on another disk, I get the bug.