Abiword starts automatically each restart, on any user. Already checked out Startup Applications. Remember session is turned off.
Additional info, may be it'll give a clue – I configured VNC server on this machine to run, so sometimes, in additional to regular Ubuntu/Unity sessions I start XFCE4 session. I think this behavior started after VNC4 configuration, but
~/.vnc/xstartup does not contain abiword – just regular xfce startup stuff.
What are additional places where I can look?