Not so much an app bug but something that's missing from the help pages.
UserAgent was added in 2011 but I'm sort of confused how it works but the WSF help pages don't mention it.
Even from the changelog description, I don't really know what it does. Are there only 2 values for this? 0 or 1?
[2011-06-01] REL: VERSION 2.49 (for Windows XP/2003/Vista/2008/7)
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[2011-05-18] NEW: added new field UserAgent for web sources which enables sending Mp3tag/#.## as user agent if set to 1.