switching users don't always lock the session

Seeing the same here.
Step to reproduce:
1. click on the session menu and choose another user (not switch from… which isn't affected by the bug)
2. login
3. logout
and then, you are connected to the first user without any password prompt

Hum LP timeout + reedit isn't good :/

Sorry, I won't do your job ted :)

This bug was fixed in the package indicator-session - 0.2.6-0ubuntu1

---------------
indicator-session (0.2.6-0ubuntu1) lucid; urgency=low

  * Upstream release 0.2.6
    ∘ Updating sessions to make guest account marked when being
      used (LP: #436030)
    ∘ String "Switch From" is miscapitalized (LP: #540265)
    ∘ Follow user switching lockdown key (LP: #504360)
    ∘ Use user avatar images in session menu (LP: #436028)
    ∘ Don't show suspend/hibernate if disabled in Policy Kit (LP: #432598)
    ∘ Lock screen when switching users (LP: #536801)
    ∘ Fix callback prototype (LP: #536990)
    ∘ Revert back to "Shut Down" instead of "Switch Off" (LP: #540056)
    ∘ Fix leaked GConf notifications
    ∘ Add GConf key for showing the "Log Out" item
    ∘ Adding the ability to specify a desktop file to have at the end
      of the menu.
    ∘ Setting up restart required notification by changing panel icon
      and icon in menus.
    ∘ Use the libindicator image helpers
    ∘ Set proper translation domain for loadable indicator
    ∘ Translation update
  * debian/control: Require libindicator 0.3.5
 -- Ted Gould <email address hidden> Thu, 18 Mar 2010 14:22:41 -0500

Now (Lucid) there is no way to prevent locking the screen when switching users. The short description of this bug is misleading, since there are reasons to not want to lock the screen when switching.

Our living room comp has two accounts, both can login without a password. So we can switch from one to the other by using 'Switch From ..' without needing a password. Yet when I click on another user in the list directly, my screen is locked and I do need a password. This doesn't make sense, the list is supposed to make switching *faster*, for me it makes it slower.

This can be 'fixed' by not allowing the accounts to lock the screen at al, but now I can't lock the screen even if I want to. FWIW, I also turned of the 'lock screen when screensaver is active', which didn't help.