I have a 2014 mac mini with 16gb ram, and my music is on an external lacie hard drive (i TB). I have the latest version of Roon and OS X 10.9.3.
I just downloaded the newest version of roon. I have huge gaps in my library, both missing tracks from albums (e.g. Rubber Soul only has one track, there are loads of others) and missing albums (Sergeant Pepper not there at all). I have a huge library so I don’t know what other albums are missing, but TONS of albums are missing tracks. I try to force the software to rescan, it looks like its scanning more than 15,000 tracks, but when it’s done it says 10,290 tracks imported. Also, when I go to look at library maintenance it says there are more than 2,000 duplicate tracks that Roon deleted. That’s somewhere around 7,000 tracks that are potentially not loaded into my library in Roon.
I want to like this software, the interface is awesome, but this is not a trivial problem, and there is no way I can find to talk to a real live person, and your help files are not very good.