[ubuntu] Mediatomb does not scan/watch directories

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http://ubuntuforums.org – I'm using mediatomb (ver.: 0.12.1-0ubuntu4) on Ubuntu 12.04 64bit. My problem is that it does not automatically scan my media directories. Through mediatomb GUI, I added two 3TB data HDDs to be watched on the following basis. Timed Full-scan Recursive Interval: 1800 sec Yes, I acknowledge that two 3TB HDDs may be too much to watch with the 1800 sec interval. However, it does scan all media files in a few minutes when I manually restart the mediatomb process. It also does scan all media files when I restart the computer. How can I let mediatomb properly watch directories? (Hardware)