I can reproduce this bug.
Tested on NVidias (but probably this does NOT matter!)
on ubuntu 9.04 amd64 (and possibly I seen it also on 8.10, not sure).
This happens when:
you switch into middle of fading-out (blackout) animation of screensaver (in
example from other VT).
1. Log in as 2nd desktop user
2. Go back to vt-1 (ctrl-alt-f7)
3. Wait the proper amount of time
4. Go to vt-2 (ctrl-alt-f9 or f8)
5. If you are "lucky" then you now see part of the already running black out
animation, and then this VT if broken - you can not pop up the unlock dialog
If you kill that screensaver (or restar that X) then it works normally.
** Changed in: gnome-screensaver (Ubuntu)
Status: Incomplete => Confirmed
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[hardy] screensaver fails to start and screen fails to completely black out
https://bugs.launchpad.net/bugs/229144
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