Xfce runs some apps twice at startup

Question

Usually Xfce runs conky and keepassx twice during the startup. I tried cleaning ~/.cache/sessions while unlogged, but it didn't work.
These apps figure only once in xfce4-sessions-settings and these are my settings.

Answer 1

I had this problem in XFCE, ages ago, worked around by auto-starting a bash script, rather than the apps themselves, then having a bit of checking in the bash script - snippets:
#!/bin/bash
export DISPLAY=":0.0"
# To get evolution to use gnome's secrets keyring
# From http://bugs.archlinux.org/task/18930
if [[ -z "$(pidof -s gnome-keyring-daemon)" ]] ; then
export `gnome-keyring-daemon -s --components=pkcs11,secrets,ssh`
fi
# Optimize firefox databases
for f in ~/.mozilla/firefox/*/*.sqlite ; do sqlite3 "$f" vacuum ; sqlite3 "$f" reindex ; done
# Done here, so it takes effect reliably!
xrdb -merge ~/.Xresources
# Make pidgin minimized at startup
sed -i -e "/list_visible/s/value='1'/value='0'/" -e "/list_maximized/s/value='1'/value='0'/" ~/.purple/prefs.xml
# Run terminal if not already running
pgrep -u myusername xfce4-terminal > /dev/null || xfce4-terminal &
(sleep 15 ; if [[ -z "$(pgrep -u myusername xscreensaver)" ]] ; then xscreensaver -no-splash ; fi) &