Thanks for the feedback, Mac. I think a lot of the new RealTracks with RealCharts were definitely recorded this way, because if you watch the fretboard view, the guitarist seems to be really intelligently choosing his position... it definitely looks like the work of a human playing a MIDI-enabled guitar, not an algorithm trying to calculate positioning.

However, in the particular song I'm having trouble with, that did not seem to be the case, because the track I was looking at in the notation window was actually an organ solo! Definitely not recorded with a guitar.

After a bit of playing around, I found something interesting. Just for fun, I tried using the "transpose" option in the notation window and set it to various settings (-24, -12, 0, 12, 24) to see if maybe the track was just in the wrong octave for a guitar. It turns out that when I set the transpose function to 24, magically, I was able to "fix" the problems I was having when manually selecting a position. It seems to work fine now.

So, problem solved, for the moment.

The only question remaining is: Why?

Does anybody have any idea why the position control seems to work in some cases, but breaks in other cases, requiring the user to manually transpose the track?