I am not sure of this, but I believe this might be an Nvidia driver
issue.  I first saw this happen when using ARCH when they had updated to
the 185 series drivers and saw it continue in the 190 series drivers.
One can work around  the problem if after start up( or login to gnome)
one switches to VT1 ( by ctrl-alt-F1 ) and then switches back to VT7 (by
ctrl-alt-F7 ).  I think that this works because one is forcing a re-draw
of the panel. My wild guess is that on start up,  the icons are drawn on
the notification area  one at a time.  When another icon is added to the
notification area, it might not fit, so the notification areal is re-
sized and the already drawn icons are moved over by a bit block transfer
to either the left(or right).  Sometimes the area that a moved icon
previously occupied is not then erased with the background.  Again, this
is just pure speculation.

Interestingly, if one adds the hide button to the panel. one will get a
half icon drawn on start up, rather than a fully drawn duplicate icon.
Forcing a re-draw of the panel by hiding and then showing the panel
using the hide button will not fix the problem.  (Because  the image for
the panel cached somewhere?)

-- 
notification area shows wrong icons. erratic behaviour
https://bugs.launchpad.net/bugs/439448
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