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You can enable DEBUG level for the logger to see detailed logs. Edit file log4j.xml in config folder and change this:
<category name="org.serviio"> <priority value="INFO"/> </category>
<category name="org.serviio"> <priority value="DEBUG"/> </category>
Restart Serviio server (if on Windows restart Serviio Windows service)
Read the result in serviio.log in log folder inside Serviio installation directory (Mac users have to 'browse contents' of Serviio.app). Make sure to revert the change back later otherwise your log file will be huge.
If the file is too huge and your problem is not related to library updates, you can filter those out.