Cannot dismiss screen saver authentication dialog

Hi,
When my screensaver (Word of the day) kick in, and I move the mouse, I need to authenticate to dismiss it (I configured it so).
So I enter my login and password. (correctly of course)
But then everything in the authentication dialog goes grey (disabled): the two edit fields, and the three buttons. But it doesn't go away and neither does the screen saver.
At this point, the Mac will not do anything: it won't go to sleep by itself, and the screen saver will not kick back in, whatever long I may try to wait.
Moreover, at this point, if I put my MacBook Pro to sleep (by closing its lid OR by pression command-option-eject, it doesn't make any difference), and I try to wake it back up, it wakes back to the all greyed-out authentication dialog: I am not even given the opportunity to enter my login/password anymore.
Everything else running on the computer seems to be running fine: I have this app which gives progress feedback with audio, and I can hear it fine working along.
But the only way it seems I can get back in control is to violently force a reboot, with lost unsaved data.
Does this ring a bell with anyone? Any suggestion for a workaround, especially one with no data loss?
Many thanks
Message was edited by: Jean-Denis Muys for a typo

First step is to run DU and repair permissions and HD while you are at it.
Second step is to create a new user and see if this issue occurs with the new user.

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/Library/Components:
iGlasses.component
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AECore.framework
AEProfiling.framework
AERegistration.framework
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Flip4Mac WMV Plugin.plugin
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at.obdev.LittleSnitchUIAgent.plist
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Message was edited by: rajaniblue

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