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I have a very serious problem. The logon screen crashes everytime I am trying to connect via my user account(other accounts crash as well).

I have already recovered a time machine backup from some days before. Unfortunately the same error occurs.

Any tips or suggestions to clarify what crashes the logon attempt?

share|improve this question
Are you able to login via SSH or such? – patrix Mar 13 '13 at 10:14
Yes. Any hints to find a detailed error log? – Rob Mar 13 '13 at 10:19
/var/log/... is always a good start – patrix Mar 13 '13 at 10:42

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