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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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closed as too localized by fossfreedom Feb 27 '13 at 17:11

This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

You might be affected by this bug – Amr Ibrahim Jan 21 '13 at 18:03

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

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