Comment 17 for bug 221363

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Marcelo Boveto Shima (marceloshima) wrote : Re: Policy Kit Unlock Buttons Greyed Out when using NX

Try to chance the session configuration on nxclient to unix-custom instead of unix-gnome.
In application put /usr/bin/nx-session-launcher-suid on 'run the following command' and 'New virtual desktop' on options

Or maybe there is a configuration file on /usr/NX/etc