Gimp launches every time I log into Xubuntu (v. 13.10).

Gimp is not shown under Settings Manager-> Sessions and startup.

It does not appear in ~/.config/autostart.

I immediately close Gimp in these cases, so it is not running when I shut down the session.

How do I stop Gimp from autolaunching on startup?

Diagnostic Info:

Note that

cd /
find . -name gimp.desktop 

Only produces

./usr/share/applications/gimp.desktop

and nothing else

Here is the output of grep -lIr 'gimp' ~/ > ~/Gimp-search-results.txt

sbin/vgimportclone
home/joshua/.gimp-2.8/controllerrc
home/joshua/.gimp-2.8/tags.xml
home/joshua/.gimp-2.8/dockrc
home/joshua/.gimp-2.8/gimprc
home/joshua/.gimp-2.8/themerc
home/joshua/.gimp-2.8/templaterc
home/joshua/.gimp-2.8/gtkrc
home/joshua/.gimp-2.8/sessionrc
home/joshua/.gimp-2.8/toolrc
home/joshua/.gimp-2.8/pluginrc
home/joshua/.gimp-2.8/menurc
home/joshua/Gimp-search-results.txt
home/joshua/.local/share/ristretto/mime.db
home/joshua/.wine/drive_c/windows/system32/gecko/1.4/wine_gecko/dictionaries/en-US.dic
home/joshua/.wine/drive_c/windows/syswow64/gecko/1.4/wine_gecko/dictionaries/en-US.dic
home/joshua/.cache/software-center/piston-helper/rec.ubuntu.com,api,1.0,recommend_app,skype,,0495938f41334883bd3a67d3b164c1d1
home/joshua/.cache/software-center/piston-helper/rec.ubuntu.com,api,1.0,recommend_app,gnome-utils,,91bba9b826fb21dbfc3aad6d3bd771cb
home/joshua/.cache/software-center/piston-helper/rec.ubuntu.com,api,1.0,recommend_app,icedtea-plugin,,7bb5e4ad0469ef8277032c048b9d7328
home/joshua/.cache/software-center/piston-helper/reviews.ubuntu.com,reviews,api,1.0,review-stats,any,any,,1c66e24123164bb80c4253965e29eed7
home/joshua/.cache/software-center/piston-helper/rec.ubuntu.com,api,1.0,recommend_app,wine1.4,,2bac05a75dcec604ee91e58027eb4165
home/joshua/.cache/software-center/piston-helper/software-center.ubuntu.com,api,2.0,applications,en,ubuntu,saucy,amd64,,32b432ef7e12661055c87e3ea0f3b5d5
home/joshua/.cache/software-center/apthistory.p
home/joshua/.cache/software-center/reviews.ubuntu.com_reviews_api_1.0_review-stats-pkgnames.p
home/joshua/.cache/oneconf/861c4e30b916e750f16fab5652ed5937/package_list_861c4e30b916e750f16fab5652ed5937
home/joshua/.cache/sessions/xfwm4-23e853443-fb4b-42fd-aa61-33fa99fdc12c.state
home/joshua/.cache/sessions/xfce4-session-athena:0
home/joshua/.config/abiword/profile