two monitors displayed vertically right clicking on desktop displays no menu on bottom monitor

To reproduce start an LXDE session with one monitor then go into arandr and have your monitors in a setup where there is one monitor over another so moving the mouse on one montior to the top goes to the top monitor and on the bottom of the top goes to the bottom monitor. The context menu showing desktop preferences works for the top monitor. On the bottom monitor there is a small area about 5 pixels tall that shows what might be a menu but then is cut off from view.

xrandr output.
Screen 0: minimum 320 x 200, current 1360 x 1792, maximum 32767 x 32767
LVDS1 connected 1360x768+0+1024 (normal left inverted right x axis y axis) 344mm x 194mm
   1366x768 60.0 +
   1360x768 59.8* 60.0
   1024x768 60.0
   800x600 60.3 56.2
   640x480 59.9
VGA1 connected 1280x1024+0+0 (normal left inverted right x axis y axis) 320mm x 240mm
   1024x768 85.0 + 75.1 60.0
   1280x1024 60.0*
   800x600 85.1 75.0
   640x480 85.0 75.0 60.0
   720x400 70.1
HDMI1 disconnected (normal left inverted right x axis y axis)
DP1 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

Description: Ubuntu 14.04.1 LTS
Release: 14.04
pcmanfm:
  Installed: 1.2.0-1
  Candidate: 1.2.0-1
  Version table:
 *** 1.2.0-1 0
        500 http://us.archive.ubuntu.com/ubuntu/ trusty/universe amd64 Packages
        100 /var/lib/dpkg/status
I expected to get what happens when you normally right click on pcmanfm with the desktop.

Instead I got a small cut off menu on the bottom of the second monitor and could not change the wallpaper on this monitor.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: pcmanfm 1.2.0-1
ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
Uname: Linux 3.13.0-32-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.14.1-0ubuntu3.3
Architecture: amd64
Config_pcmanfm_System_Lubuntu: Error: [Errno 2] No such file or directory: '/etc/xdg/pcmanfm/Lubuntu/lubuntu.conf'
CurrentDesktop: LXDE
Date: Sat Aug 9 12:18:14 2014
InstallationDate: Installed on 2013-10-18 (295 days ago)
InstallationMedia: Lubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016)
SourcePackage: pcmanfm
UpgradeStatus: Upgraded to trusty on 2014-04-18 (112 days ago)