said by Olias:
Where in the event log should I look?
Both. But 'system' seems more likely. (It'll probably make it easier if you use the 'filter' mechanism to show only the non-informational events)
I use no password, so if I try it will it automatically log me back on?
Nope, I think you'll have to select the only user. But it doesn't matter if it doesn't - the object is to go through a logoff sequence (which is when the 'saving' happens), not to remain logged off.