Dual monitor only left unity toolbar allows drag and drop of new shortcuts.

[Brook Harty]

When running dual monitors, the left screen toolbar only allows new shortcuts to be drag and dropped.

On right screen monitor, click dash, search terminal, drag terminal to unity bar until "drop to add application: and nothing happens.
Perform same action on left screen, it adds the shortcut to unity bar.

Unity is activing differently on right primary screen. Using nvidia primary right screen with nvidia-settings.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: unity 5.6.0-0ubuntu4
ProcVersionSignature: Ubuntu 3.2.0-19.30-generic 3.2.11
Uname: Linux 3.2.0-19-generic x86_64
NonfreeKernelModules: nvidia wl
ApportVersion: 1.94.1-0ubuntu2
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
Date: Mon Mar 19 12:05:37 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20120306)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: unity
UpgradeStatus: Upgraded to precise on 2012-03-14 (5 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Evan McIntire (mcintire-evan)]

(Real sorry for the tag nonsense there)

Anyway, I'm not able to reproduce this on Xenial, could someone on 12.04 or 14.04 test this to see if it's still valid?