Does /var/log/entropy/rigo-daemon.log say anything? Not sure if rigo-daemon is related to that.
I think without exact knowledge how rigo calls the polkit authorization, it won't be possible to track the problem.
Perhaps you can try uninstalling and reinstalling rigo?
If it's still not working, add a new user and give add him to all groups required to access entropy and superuser rights. Run rigo as that user, and see what happens. If it everything is normal, then the settings of your normal user got messed up somehow. Delete the temporary user account afterwards, if it's not needed anymore (for security reasons).
And if that doesn't work, I would file a bug report.
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