Comment # 5 on bug 1210031 from Carlos Robinson

I noticed something.

When the session restore on login fails, in the previous session closure I
notice that the Firefox window, which is on workspace 3, jumps to workspace 1
for an instant, then the session closes.

This matches the idea I found on internet, that "This apparently happens when
xfce4 has trouble shutting down a session".

I also suspect that the problem happens when I click on "restart machine", and
not when I click "log out". At least, I clicked six times on log out, and it
did not happen.