Hi gone through strange issue . guest account asked me a password after I have selected lock screen option from top panel . give a try with guest or enter but Nothing up
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1You might be affected by this bug https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1022858 – Amr Ibrahim Jan 21 '13 at 18:03
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While this might be a bug... to work around it I have found that if you click on "switch user" then select the guest account you will get back in with no problems

Tiris
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