Hi PorkButter,
I'm going to ask an idiotic question so bear with me.
Are you running NZBGet under Windows? Or on your FreeNAS box?
...and...
If running under Windows, do you start it using an icon on your desktop, or does it start as a Windows service when your computer starts up?
My reason for asking is we need to work out what is involved in putting a file in a path somewhere. If you're running NZBGet under windows, then from the looks of your config
DestDir : /media/Minerva/Downloads/Finished
InterDir : /media/Minerva/Downloads/NZB
those paths will not work because they're not UNC paths to your FreeNAS box file share.
They should be \\NASBOX\sharename\Downloads\Finished (or similar) and
\\NASBOX\sharename\Downloads\NZB (or similar)
The paths in your config would work in in a terminal when SSH'd into your FreeNAS box but if NZBGet isn't running on your FreeNAS box then those paths are not applicable.