Hi Felix,
> 2013-05-17 12:57:21,939 FATAL - Authorization failure: Authorization error:
> Failed to get the local user id via glexec: glexec error: [gLExec]: LCAS
> failed. The reason can be found in the syslog.
>
> Where may I look?
As the message says: did you check the syslog, usually /var/log/messages?
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