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[Kalon Mills <kalaxy@xxxxxxxxx>]

I have also found like K_Mux noted above that this happens to me when
related to dual monitor support.  I did no upgrades to xfce but rather
switched my video driver.  I switched from the open source radeonhd to
open source radeon driver.  The radeonhd driver always initialized my
dual screen without me having to do a bit of work; didn't even have to
put it into my xorg.conf file.  However when I switched into the radeon
driver it defaulted to mirror mode on my dual screen and multiple
instances of the window manager appeared.

I can verify that clearing the .cache/sessions fixes the problem for
that time only.  (If I ever save the session and restart then the
problem reoccurs.)  When starting with a fresh session it still starts
in mirror mode.  I use xrandr --output DVI-1 --right-of DVI-0 to
properly initialize my screen and then I am good to go until restarting
X.

Another work around is for me to only have one monitor attached, startx,
plug in the other monitor, enable and configure the other monitor.  I
have not tried configuring my xorg.conf to default to a configured state
which may also solve the problem.  But I can confirm that in my case
this issue is dual monitor/xrandr setup related.

-- 
Multiple instances of xfdesktop started simultaneously
https://bugs.launchpad.net/bugs/329616
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Team, which is the registrant for xfdesktop.