After the login, it should switch to a graphical view of things. There seems to be a problem there. Try attaching a regular computer display to the VGA out (if you have one), and see if that helps.
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I won´t mention which plugin since I don´t know were this forum stands in this kind of question that is brought up with the type of functionality this plugin add.
Problem is, I have found the setup.conf file in at least 2 different places! (/etc/vdr and /var/lib/vdr) and I don't know anything about Linux, so I'm not really sure which one I should be changing!