Thank you, Jeff and Charles, editing the startupcommands file as you suggested did the trick!
I've got Compton, Dropbox, Synclient TouchPadOff, and nm-applet running at startup, editing the file ~/.e/e/applications/startup/startupcommands with epad. The file now looks like this:
sh -c 'compton -b &' | \ ~/.dropbox-dist/dropboxd | \ synclient TouchPadOff=1 | \ nm-applet
I had less luck with the Moksha gui. I don't know whether that's the reason, but something might have happened to my .desktop files at ~/.local/share/applications: when I double-click, for instance, the file Touchpad_Off.desktop (a personal application launcher that I created a while ago), I get an "untrusted application launcher" error. The file doesn't appear to be executable. I guess that's why adding or removing Touchpad_Off, or Compton, or Dropbox, via the Startup Applications gui didn't do anything for me.
But I'm totally happy using epad on the startupcommands file instead.
Thank you so much for your help!Go to the full post