I obviously double checked the connections and my left speaker is connected to the output labeled "Master Out Left". However, it is located on the left when looking from above
Hummm. That may be a part of the problem. When we checked for this L/R inversion on our development machines we found that the behavior was consistent with the L/R printings. That's why I asked you to check your connections.
Us the developers are using prototype machines and it appears that ... the printed labels are on the reverse order on these prototypes
So yes, there's an L/R inversion. I've added that to the bug data base, we'll fix it asap.