Thanks ECF,
As a good practice i gathered all Media under one directory that i want to publish through uPNP to my PS3.
Is there a document that describes what are the current constraints of the directories and file names. (non supported characters (like quote, @, ...), maximum filelength, spaces, maximum nesting of directories, ...)? A one-pager is enough and it would avoid a lot of frustration to a lot of non-techies.
The document can be updated with each new release.
Thanks for your answer!