Unity launcher keyboard shortcut starts Chrome on wrong monitor with dual monitors

I have Chrome pinned to the Unity launcher, with launcher set to autohide. If I position the mouse pointer on the right-hand monitor and press Super, the launcher on the RH monitor appears, but when I then use Super+number to start Chrome from that launcher, the Chrome window appears on the left-hand monitor. If I press Super to show the launcher on the RH monitor, and then use the mouse to start Chrome, the Chrome window appears on the RH monitor.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: unity 5.8.0-0ubuntu2+ojno1 [origin: LP-PPA-ojno-unity-minimize-on-click]
ProcVersionSignature: Ubuntu 3.2.0-22.35-generic 3.2.14
Uname: Linux 3.2.0-22-generic x86_64
ApportVersion: 2.0-0ubuntu4
Architecture: amd64
CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell]
CrashDB: unity
Date: Mon Apr 9 16:51:00 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120328)
ProcEnviron:
 LANGUAGE=en_AU:en
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_AU.UTF-8
 SHELL=/bin/bash
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)