No file detected after update

I just updated Serviio to the last version (on Ubuntu) and I've also upgraded Ubuntu to 13.04 (so I don't where the problem belongs).
Serviio server is working fine, but no new folder or file has been recognised by Serviio (so no new files added to the database). The Ubuntu installation is clean, and I've also tried a clean installation of Serviio.
Thank you!

[zip]

Either file system rights or FFmpeg version too old, I suspect

I didn't install ffmpeg at all.
Thank you very much
I love Serviio and so I suggest to put a ffmpeg warning in the console at first start

[zip]

There is a warning in the log.

Ok
Maybe a warning in the software would have been more noob-proof, but it's just a suggestion.
Thank you again for your work!