[vdr] Burn plugin permissions problem

I can create DVD ISO files using vdr-burn-0.1.0-pre20 ok but only if vdr is run as root. If I run vdr without root privelage DVD ISO creation fails at the start. My /tmp folder and ISO destination folder have the appropriate access rights. The burn shell scripts are marked executable and can be read by others. Any one know what is wrong here? Here is the dvd.log file

[render] sh: /usr/local/bin/vdrburn-dvd.sh: Permission denied [render] sh: /usr/local/bin/vdrburn-dvd.sh: Permission denied [demux] sh: /usr/local/bin/vdrburn-dvd.sh: Permission denied

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